Question about Casio FX-115ES Scientific Calculator

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When using trigonometric functions (cos, sin, tan) and their inverses (arccos, arcsin, arctan) one must be aware that the result will depend on the default angle unit : radian, degree, or grad.

Apparently you are working with the degree as the angle unit, so you must configure the calculator for that unit. (See screen capture below)

Press [SHIFT][MODE] [3:Deg]

Posted on Aug 10, 2010

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Posted on Jan 02, 2017

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Since this calculator cannot perform symbolic manipulations (algebra) you never need to type in sin(theta) or cos(theta). To calculate the sine of an angle (whatever the name of the angle may be) just press the **sin** key followed by an angle value and the function will be calculated. same thing with any other trigonometric function.

Make sure that the angle units is set to the unit required by your calculation: degree, radian, or grad.

Make sure that the angle units is set to the unit required by your calculation: degree, radian, or grad.

Jul 16, 2014 | Office Equipment & Supplies

That is all you need.

Dec 06, 2013 | Casio Algebra FX 2.0 Calculator

To calculate the Cosine of an angle, you first make sure that the angle unit on your calculator is set to the correct one (degree, or radian). After that it is all simple. Enter the angle value (50 degrees) then press the [COS] key. If you get an error then press the COS key followed by the angle value then press =.

Note if your calculator display Cos ( , with a left parenthesis, then you have to press COS first followed by the angle value and possibly the right parenthesis.

Note. The theta here is of no relevance.

Note if your calculator display Cos ( , with a left parenthesis, then you have to press COS first followed by the angle value and possibly the right parenthesis.

Note. The theta here is of no relevance.

May 27, 2013 | Casio FX350MS Scientific Calculator

The differentiation rules for trigonometric functions you have been taught (ex: derivative of sin(x) is cos(x) ) are correct if the angle unit is in radians. If you use any other angle units (ex: degrees, grads) there will be a conversion factor :derivative of sin(ax) with respect to x is a.cos(ax).

Hope that helps

Hope that helps

Feb 02, 2013 | Texas Instruments TI-Nspire Graphic...

If you have learned about the trigonometric ratios (sine, cosine and tangent) you can use the tangent of the angle.

Let your run be to the right ( along the positive x-axis) and the rise be upwards along the positive y-axis. The tangent of the angle is

tan (theta)=rise/run=7.5/12

If the calculator is set with angle unit in degrees, the angle is obtained as the arc tangent of the (rise/run) value.

theta= arctan(7.5/12)=32.00538321 or about 32 degrees.

The arctan is the inverse of tan. To access it on the calculator press [2nd F][tan]

Depending on the calculator (sorry I do not have your model under my eyes)

Press**[2nd F][tan] ( 7.5/12) [=] **

or

**7.5/12 =** then** [2nd F][tan] [ALPHA][Ans] [=]**

Let your run be to the right ( along the positive x-axis) and the rise be upwards along the positive y-axis. The tangent of the angle is

tan (theta)=rise/run=7.5/12

If the calculator is set with angle unit in degrees, the angle is obtained as the arc tangent of the (rise/run) value.

theta= arctan(7.5/12)=32.00538321 or about 32 degrees.

The arctan is the inverse of tan. To access it on the calculator press [2nd F][tan]

Depending on the calculator (sorry I do not have your model under my eyes)

Press

or

Jan 21, 2012 | Sharp Office Equipment & Supplies

In right triangle we are making 90 degree angle triangle, we can have problem for finding hypotenuse or finding sin or cos values of the side of the triangle.
For ex,Find out the hypotenuse,sin and cos value of the right triangle with base 4 cm and perpendicular 3 cm
Solution:Hypotenuse = SQRT(4^2 + 3^2)
=SQRT(4*4 + 3*3)
=SQRT(16+9)=SQRT(25)=5 cm
For right triangle,
sin(x)=3/5=0.6
cos(x)=4/5 =0.8

Jul 16, 2010 | Super Tutor Trigonometry (ESDTRIG) for PC

Hi

I'm studying Physics, not CS, but I've had a few brushes with OpenGL.

I'll use a Basic-like pseudocode syntax since I don't know what language you're using, and basic is very easy to read:

'Constants - Radius is radius of the circle

Const PI = 3.14159, Radius = 10

'Current angle, and angular velocity (dTheta / dt)

Dim Shared Theta as Single, Omega as Single

'Frame is called when you want to draw a new frame

Sub Frame(dt as Single)

'dt is number of seconds passed since last frame (typically less than one, since you want several frames per second)

'Initialize the frame (clear buffers, set up projection, etc)

InitFrame

'Increase angle

Theta = Theta + (Omega * dt)

'Calculate co-ordinates of point

X = Radius * Cos(Theta)

Y = Radius * Sin(Theta)

glBegin(GL_POINTS)

'Set the colour of the point

glColor(<r>, <g>, <b>, <a>)

'Draw the point

glVertex2f(X, Y)

glEnd()

'Display the frame

RenderFrame

End Sub

I'm studying Physics, not CS, but I've had a few brushes with OpenGL.

I'll use a Basic-like pseudocode syntax since I don't know what language you're using, and basic is very easy to read:

'Constants - Radius is radius of the circle

Const PI = 3.14159, Radius = 10

'Current angle, and angular velocity (dTheta / dt)

Dim Shared Theta as Single, Omega as Single

'Frame is called when you want to draw a new frame

Sub Frame(dt as Single)

'dt is number of seconds passed since last frame (typically less than one, since you want several frames per second)

'Initialize the frame (clear buffers, set up projection, etc)

InitFrame

'Increase angle

Theta = Theta + (Omega * dt)

'Calculate co-ordinates of point

X = Radius * Cos(Theta)

Y = Radius * Sin(Theta)

glBegin(GL_POINTS)

'Set the colour of the point

glColor(<r>, <g>, <b>, <a>)

'Draw the point

glVertex2f(X, Y)

glEnd()

'Display the frame

RenderFrame

End Sub

May 16, 2009 | Advanced Graphics Programming Using OpenGL...

Calculator turns on in "degree" mode. Just enter angle in degrees then press "SIN", "COS" "TAN".

Most people work in degrees but you can switch to Rads or Grads to Degrees modes by pressing "DRG" repeatedly with zero displayed, Current angular mode will show in display.

Get a new instruction booklet by download from TI website

Most people work in degrees but you can switch to Rads or Grads to Degrees modes by pressing "DRG" repeatedly with zero displayed, Current angular mode will show in display.

Get a new instruction booklet by download from TI website

Oct 24, 2008 | Texas Instruments TI-30XA Calculator

Hello,

**The e is the same, it is the exponential**. According to Euler's relation

**e^(i theta) = cos(theta) + i sin(theta),** where** i** is the imaginary unit.

When represented on the complex plane (x,iy) the point (cos(theta), sin(theta)) is at the extremity of a vector of length 1 and making an angle theta with the real axis.

In (plane) polar coordinates, a point is defined by the radius r, and the angle, theta, it makes with the x axis, measured in the trigonometric (counterclockwise) direction. It is structurally equaivalent to representing it in the complex plane as r*e^(i*theta). Since r is the measure ot is radius, and the theta is it argument (angle). The complex notation is used for its convenience when adding vectors (as is AC circuits)

That is the theory.

I am inserting a clipping from the book to show you how to convert between polar and rectangular coordinates.

When represented on the complex plane (x,iy) the point (cos(theta), sin(theta)) is at the extremity of a vector of length 1 and making an angle theta with the real axis.

In (plane) polar coordinates, a point is defined by the radius r, and the angle, theta, it makes with the x axis, measured in the trigonometric (counterclockwise) direction. It is structurally equaivalent to representing it in the complex plane as r*e^(i*theta). Since r is the measure ot is radius, and the theta is it argument (angle). The complex notation is used for its convenience when adding vectors (as is AC circuits)

That is the theory.

I am inserting a clipping from the book to show you how to convert between polar and rectangular coordinates.

Oct 10, 2008 | Casio FX1.0 Plus Calculator

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