Question about Casio FX-115W Plus Calculator

1 Answer

Csc, sec functions

I keep getting a error when I enter csc for a angle. ecample csc for 60 deg = error

maybe I'm pushing the wrong buttons,,,,

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  • Casio Master
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Hello,
I have not yet seen a calculator that has a dedicated key for the cosecant , secant, nor cotangente functions, because they are directly connected with the sine, the cosine, and the tangente.

Cosecant (x) = 1/sin(x)
Secant (x) = 1/cos(x)
Cotangente(x) = 1/tan(x)

Do not confuse these functions with the inverse trigonometric functions, usually represented as
arccosine = arccos; on calculators cos^-1,
arcsine = arcsin ; on calculators sin^-1
arctangent= arctan ; on aclculators tan^-1

Hope it helps.

Posted on Oct 03, 2009

  • k24674 Oct 04, 2009

    Correction: My TI92Plus, and the TI89Platinum do have commands for the secant, cosecant, and cotangent, but they are not accessed through dedicated keys.

  • k24674 Oct 11, 2009

    I checked the manual for the FX-115W and foun d no reference to the secant, cosecant and cotangent function. Would you care to verify what calculator you are using?

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1 Answer

Cot(x) = -0.6


Let's start with a little background.

The cot(x) is also known as the cotangent(x) and it equals 1/tan(x) which equals cos(x)/sin(x). I'm showing these formulas because your calculator may not have a cot button but it will probably have buttons for tan, cos, and sin.

Your calculator may also have buttons for tan-1, cos-1 and sin-1. These are the inverse functions for tan, cos, and sin. If you enter a number and then push the tan-1 button, the result is the angle whose tangent is the entered number. For example, it you enter 1 and push the tan-1 button the answer will be 45 deg because tan (45 deg) = 1.

Now let's look at the problem, cot(x) = -0.6.
The first thing we need to know is do you want the answer in degrees or radians? Your calculator will have both modes. The default mode when you first turn it on is probably degrees. If this problem is in radians you will need to change the mode of your calculator over to radians before we start.

If cot(x) = -0.6, then tan(x) = 1/-0.6 from the formula I showed in the background section.

This means tan(x) = -1.6666666...

Now we just enter -1.66666667 and hit the tan-1 button to get the answer.

If we're operating in radians the answer is -1.0307 radians.
If we're operating in degrees the answer is -59.036 deg.

I hope this helps you out.

Dec 06, 2011 | SoftMath Algebrator - Algebra Homework...

1 Answer

Ok so my math hw only gave me the degree, minute, sec format of the angle. How do i input it in the fx 155 es to work out and find the rest of the angles, sides, etc?


Label of key [deg symbol ' "]. It is between [(-)] and [hyp]

To enter a value in decimal degrees
12.58 [deg ' "] [=] Screen displays 12.58 deg on top line and 12 deg 34' 48" on bottom line.
Pressing the [deg ' "] key while this value is displayed will show 12.58

To enter a DMS value:

Press the [deg ' "] key after each number even if one of the numbers D,M,S is nill (0).
Exemple Enter 25 deg 0 ' 48"
25 [deg ' "] 0 [deg ' "] 48 [deg ' "] [=]
Screen displays 25 deg 0' 48" on bottom line
Pressing the [deg ' "] key converts this result to decimal degrees 25.013

This showed you how to enter angles in DMS or DD. For the rest 'find the angles, etc.' you should refer to your trigonometry manual: You have the definitions of the trigonometric ratios, the sine law, the cosine law to resolve triangles.

Feb 24, 2011 | Casio FX-115ES Scientific Calculator

1 Answer

Not sure how to use the calculator for my physics class? Problem x and y components of the vector A = 10.0 @ 60.0 degrees


There is not much you can do with the information you provide. One has to assume the application point to be (0,0) and the angle the vector makes with the positive X-axis is 60 degrees
The X-Component is X_A=10*cos(60 deg)
The Y-component is Y_A=10*sin(60 deg)

To calculate the values of the X, and Y components you must make sure the angle unit is degree.
  1. Press [MODE]
  2. Move cursor to the line that says RADIAN DEGREE
  3. Highlight DEGREE and press [ENTER].
  4. Press [2nd][QUIT] to exit the configuration screen.

To get X_a type in 10 [COS] 60 [ENTER]

Oct 08, 2010 | Texas Instruments TI-84 Plus Calculator

1 Answer

How can i find a minute sign in my Ti 83


Press [2nd][APPS] to open the (ANGLE) menu. The symbol for the minutes is the second in the list. To enter the seconds press [ALPHA] [+].
When entering an angle in D(egree)M(inute)S(second), you must enter the number of minutes even if it is zero.
12 deg 25" will give a syntax error, so you have to type 12 deg 0' 25"

Apr 09, 2010 | Texas Instruments TI-83 Plus Calculator

1 Answer

How do you use the pol and rec


To avoid errors make sure that the angle unit is THE ONE required by your problem. To verify or to change the angle unit press [SIFT][MODE] and select [3: Deg] for degrees, [4:Rad] for radians, or [5:Grad] for grads.

Convert from rectangular to polar

[SHIFT][+] (Pol) . Screen displays Pol(
You enter the X-coordinate, and the Y coordinate separated by a comma, then you close the parenthesis and press [=].

Exemple: Polar coordinate of the point (1,1)
Pol( 1, 1) gives
r=1.414213562 (square root of 2)
θ=45

Here is how you enter it
Press [SHIFT][MODE][2:LineIO]
[SHIFT][POL] 1 [SHIF] [,] 1 [)] [=]

The screen displays
Pol(1,1)
r= 1.414213562
θ= 45


Convert from polar to rectangular coordinates

Rec ( radius, angle) =

Exemple: Recatngular coordinates of (r=3, θ=60°)
[SHIFT][Rec] 3 [SHIFT][,] 60 [ ) ] [=]
The screen displays
Rec(3,60)
X= 1.5
Y= 2.598076211


Jan 19, 2010 | Casio FX-115ES Scientific Calculator

1 Answer

How do I find degrees minutes and seconds on my ti 84 plus?


On this family of calculators, you do as follows
  1. Enter the first number (degrees), ex:15
  2. Press [2nd][APPS] (ANGLE) to access the Angle functions
  3. Select [1: degree symbol] [ENTER]
  4. Main screen shows 15 deg
  5. Enter the minutes, ex 25
  6. Press [2nd] [APPS](ANGLE) to access Angle functions
  7. Select [2:' apostrophe] [ENTER]
  8. Screen echoes 15 deg 25'
  9. Enter the seconds number, ex 32
  10. Press [ALPHA][+] (") to access the double quotation mark.
  11. Screen echoes 15 deg 25' 32"
  12. Press [ENTER]
  13. Calculator converts this in decimal degrees 15.42555556

To convert this back to DMS, press [ANGLE][|=>DMS][ENTER] and the calculator displays the original value 15 deg 25' 32"

Jan 11, 2010 | Texas Instruments TI-84 Plus Calculator

1 Answer

If a textbook problem is given in DMS notation, how do I enter the DMS notation into the TI84 to get decimal degrees?


On this family of calculators, you do as follows
Enter the first number (degrees), ex:15
Press [2nd][APPS] (ANGLE) to access the Angle functions
Select [1: degree symbol] [ENTER]
Main screen shows 15 deg
Enter the minutes, ex 25
Press [2nd] [APPS](ANGLE) to access Angle functions
Select [2:' apostrophe] [ENTER]
Screen echoes 15 deg 25'
Enter the seconds number, ex 32
Press [2nd][+] (") to access the double quotation mark
Screen echoes 15 deg 25' 32"
Press [ENTER]
Calculator converts this in decimal degrees 15.42555556

To convert this back to DMS, press [ANGLE][|=>DMS][ENTER] and the calculator displays the original value 15 deg 25' 32"

Jan 06, 2010 | Texas Instruments TI-85 Calculator

1 Answer

Is the calculator suppossed to have "DEG" in the bottom right hand corner? I am trying to enter the numbers for the compound interest formula and I keep getting "Syntax Error" Is it because of the...


The DEG indicator on the screen is a reminder to the user that the ANGLE unit is in degrees. You can change the angle unit to Radian or Grads. That does not have any incidence on other calculations. It only affects the computation of trigonometric functions : sine, cosine, tangent, arc cosine, arc sine and arctangent. So if you have syntax error in the calculation of the interest formula, I can assure you it has NOTHING to do with the angle unit.
I do not see the formula you are trying to use, so I cannot be sure what you are doing wrong.
  1. Possible wrong usage of the regular minus sign instead of the change sign (-) or (+/-)
  2. Missing right parenthesis
  3. A right parenthesis is inserted at the wrong place.
  4. Incorrect use of the power function
I suggest you write the correct formula on paper and enter it step by step. A step is defined by an operation: multiplication, division, power. Start with the content of parentheses and work toward the outside. The last result is always the one stored in Answer memory (Ans).

Dec 23, 2009 | Texas Instruments TI-30X-IISTK Scientific...

1 Answer

Can you show how to convert pola to rectangular o


Hello,
To avoid errors make sure that the angle unit is THE ONE required by your problem. To verify or to change the angle unit press [SIFT][MODE] and select [3: Deg] for degrees, [4:Rad] for radians, or [5:Grad] for grads.

Convert from rectangular to polar

[SHIFT][+] (Pol) . Screen displays Pol(
You enter the X-coordinate, and the Y coordinate separated by a comma, then you close the parenthesis and press [=].

Exemple: Polar coordinate of the point (1,1)
Pol( 1, 1) gives
r=1.414213562 (square root of 2)
θ=45

Here is how you enter it
Press [SHIFT][MODE][2:LineIO]
[SHIFT][POL] 1 [SHIF] [,] 1 [)] [=]

The screen displays
Pol(1,1)
r= 1.414213562
θ= 45


Convert from polar to rectangular coordinates

Rec ( radius, angle) =

Exemple: Recatngular coordinates of (r=3, θ=60°)
[SHIFT][Rec] 3 [SHIFT][,] 60 [ ) ] [=]
The screen displays
Rec(3,60)
X= 1.5
Y= 2.598076211


Hope it helps.

Nov 14, 2009 | Casio FX-115ES Scientific Calculator

2 Answers

Trigonometric functions


Put the calculator in radian mode. Find the sine of the angle (sin(angle)), invert the result (1/x or x^(-1)). csc = 1 / sin

Jan 27, 2007 | Texas Instruments TI-86 Calculator

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