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# Howto input theta in programme - Office Equipment & Supplies

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If it exists, it must be in the catalog of commands. In polar coordinates, the key X,T, Theta enters the Theta symbol when pressed.

Posted on Dec 10, 2016

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Posted on Jan 02, 2017

SOURCE: how do you input arccos

Press 2nd SIN 3 2 / 1 4 5 ) =

Make sure you have the desired angular mode set before you do this.

Posted on Jun 22, 2013

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## Related Questions:

### How do I switch from T to theta when I press the X,theta,T button while in parameter mode?

In parametric graphing mode, pressing the X, theta, T button will enter the Theta variable.

Apr 11, 2016 | Casio FX-9750GII Graphing Calculator

### Complex polar angle scientific

{r, theta} is equivalent to r*exp(i*theta)=r*cos(theta) +i*sin(theta)
That is all you need.

Dec 06, 2013 | Casio Algebra FX 2.0 Calculator

### X= disappeared from the Y=

You have several types of graphs
Function graphs
Y_1=f(x), Y1=3X^2-4, [X, T, Theta, n] key types X
Polar graphs r=F(theta), r=r_o*ln(theta). [X, T, Theta, n] types Theta
Parametric graphs X_1=f(T) and Y_1=g(T). [X.T, Theta, n] types T
Examples: X_1= cos(T). Y_1= 2(1--sin(T))
Sequence graphs u_n+1= f(u_n), [X,T,Theta,n] types n

Nov 21, 2013 | Texas Instruments TI-84 Plus Calculator

### X= disappeared

You have several types of graphs
Function graphs
Y_1=f(x), Y1=3X^2-4, [X, T, Theta, n] key types X
Polar graphs r=F(theta), r=r_o*ln(theta). [X, T, Theta, n] types Theta
Parametric graphs X_1=f(T) and Y_1=g(T). [X.T, Theta, n] types T
Examples: X_1= cos(T). Y_1= 2(1--sin(T))
Sequence graphs u_n+1= f(u_n), [X,T,Theta,n] types n

Nov 21, 2013 | Texas Instruments TI-84 Plus Silver...

### How do we change between X, T, Theta and n in the graphing calculator? I need the X, but it only inputs T....

Press the MODE button, select FUNC on the fourth line, then press 2ND QUIT.

FUNC gives you X, PAR gives you T, POL gives you theta, and SEQ gives you n.

Oct 07, 2013 | Texas Instruments TI-83 Plus Calculator

### How do you input arccos

Press 2nd SIN 3 2 / 1 4 5 ) =

Make sure you have the desired angular mode set before you do this.

Jun 22, 2013 | Texas Instruments TI 30XIIS Scientific...

### Find theta on TI-30XS MultiView calculator... I can't :(

No, your calculator does not know a variable called theta. But what is theta but a symbol to represent a variable. Usually it is used to represent an angle in polar coordinates. It is just the usage and it is not really essential. You can do conversion from polar to rectangular coordinates and from rectangular to polar coordinates but it does not matter what the angle variable is called.
Go ahead, do all the calculations you want that involve an angle. If the calculator can perform them , they will be evaluated correctly and the name you give the angle value (alpha, beta, theta, iota...) is immaterial.

Apr 26, 2012 | Texas Instruments ti-30xs multiview...

### When polar graphing (type r = ) is there a way to change the limit of theta. For instance if i want my theta to be in between 0 and 4pi

Press WINDOW. Use the arrow keys to move to the theta-max line and enter the upper limit. To change the lower limit, change the value for theta-min.

Feb 15, 2011 | Casio FX-9750GPlus Calculator

### How do you plug in functions in to the calculator?

I am not quite sure what you mean by plug in. However, if you want to know how to type in functions for the purpose of graphing them, you do so as follows
Press [Y=] key to the left and top of keypad.
The Y= editor screen opens with the cursor blinking to the right of an equal sign. Type in your expression, using the correct keys as if you were calculating.

To enter the variable X (for drawing y=f(x) functions) press the [X,T, theta, n] key to the right of the [ALPHA] key. The key [X,T,theta,n] is context sensitive: its output is decided by the type of functions you are graphing.
1. For function plots, [X,T,theta, n] enters X
2. For parametric plots, [X,T,theta,n] enters t
3. For polar plots [X,T,theta, n] enter the angle variable theta
4. For sequence plots [X,T,theta,n] enters the recurrence variable n

Feb 15, 2010 | Texas Instruments TI-83 Plus Calculator

### Can't transform from polar to rectangular

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.

Oct 10, 2008 | Casio FX1.0 Plus Calculator

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