# Tan cos etc with casio fx-83ES

If i put in tan45 i get answer 0.85408.... when tan 45 = 1 . other trig probs give wrong answer

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Set it up in correct rig mode, mode button (several times) until you get a window showing deg - rad - grad, choose deg (degree mode)

Posted on Dec 03, 2008

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## Related Questions:

### Bought a Casio FX-260 calculator. Im trying to find out how to input a trig formula. E.g 2/cos(70)= 5.84 When I do put this in the calculator in scientific mode it gives me a different answer. Help?

Try changing this and hopefully it will work.

Otherwise, post again!

Good luck,

Paul

Jul 25, 2016 | Casio Office Equipment & Supplies

### How do i get my calculator to do the trig problem Tan45=1? It is telling me Tan45=1.61977, and i know that isn't right.

tan(45 deg)=1
If your problems require angles to be measured in degrees, make sure that the calculator's angle unit is set to degrees.
In RUN screen press [SHIFT][MENU] (SetUp) select the angle line and press function key under the tab Deg (should be F1).

Sep 17, 2013 | Casio FX-9860G Graphic Calculator

### Use the identity tan(x/2)=sinx/1+cosx to solve for the value of tan45 degrees

tan(x/2)=sin(x)/(1+cos(x))
Setting x/2=45, means that x=90 (degrees)
But cos(90)=0 and sin(90)=1. Thus tan(45)=1/(1+0)=1.

Mar 13, 2013 | SoftMath Algebrator - Algebra Homework...

### What is d use of hyp function??

The hyp key is used with the cos, sin, and tan keys to compute the hyperbolic cosine, hyperbolic sine, and hyperbolic tangent functions (and their inverses).

The hyperbolic functions are computed the same way as the trignometric functions: simply press the hyp key just before pressing the desired trig key.

May 04, 2010 | Casio FX-300MS Calculator

### How to use trig function keys on my casio fx-300ES

Hello,
You have 3 keys for the main trigonometric functions: [SIN], [COS] and [TAN]
To use them correctly you must set the angle unit to the one your problem calls for.
Press [SIFT][MODE] [3:Deg] for degree, [4:Rad] for radian, [5:Grad] for grad. Dependig on angle unit chosen a small D, R, or G appears on the top of the screen.

If you need the inverse trigonometric functions arcsine, arccosine, arctangent, you access them by first pressing the [SHIFT] key
Thus
arcsine [SHIFT][SIN] (sin^-1)
arcosine [SHIFT][COS] (cos^-1)
arctangent [SHIFT][TAN] (tan^-1)

The syntax for the function is
[SIN] # [ ) ] [=]; [SIN] 30 [ ) ] [=] gives 0.5
[COS] # [ ) ] [=] [COS] 19 [ ) ] [=] gives 0.945518576

Note: if the argument of the functions are numbers, the right parenthesis is not necessary. But if the argument is an expression (with various operations) better put the parenthesis to make sure the calculator is performing as one wants it to.

By the way, there are no keys, or key combinations to calculate cotangent, cosecant, and secant, but you can use the definitions:

cotangent (x) = 1/tan(x) Do not confuse it with tan^-1
cosecant(x) = 1/sin(x) Do not confuse it with sin^-1
secant(x) = 1/cos(x) Do not confuse it with cos^-1

Hope it helps.

Oct 30, 2009 | Casio fx-300ES Calculator

### Sin, cos, or tan, on casio wrong answer. another cac right answer

Hello,
It may be due to the angle unit used. You can have angles in degrees, in radians, and in grads. You should set the default angle unit to waht you problem calls for.
To set degree as default SHIFT MODE 3
To set radians as default SHIFT MODE 4
To set grads as default SHIFT MODE 5

The values of angles calculated by the inverse trigonometric functions are in the default unit that is set . This may be the source of the wrong answers that you get.

Hope it helps.

Sep 16, 2009 | Casio FX-115ES Scientific Calculator

### Inverse Functions on Casio fx-270W PLUS don't seem to work

because cotangent, cosecant, and secant are all inverse trig functions, just type in 1 / |shift| trig function and the number if you are finding the angles. It might not be a dedicated button, but its an extra push, and it will give you the same result. *note that I put the shift press only because that is how you get the inverse tan to get an angle from a tan ratio.*

May 04, 2009 | Casio FX-270W Calculator

### Locating the inverse key for trig. functions

hello,
Use [SHIFT] [COS^-1], [SHIFT][SIN^-1] and [SHIFT][TAN^-1] the keys are the same as the direct function, but they are accessed via [SHIFT].
Be carefule with the angle units when handling trigonometric and inverse trigonometric functions
Hope it helps

Dec 07, 2008 | Casio FX-300MS Calculator

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