MathU™ RPN 2.2 for iPhone
Documentation
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Trigonometric Functions
The trigonometric functions are sensitive to the angle mode: degrees, radians, or grads (deg, rad, or grd in the display where 360 degrees = 2 pi radians = 400 grads).
- When in degree mode, inputs to SIN, COS, and TAN are assumed to be in degrees and the results from SIN−1, COS−1, and TAN−1 are in degrees.
- When in radian mode, the inputs and outputs are assumed to be in radians.
- When in grads mode, the inputs and outputs are assumed to be in grads.
Set the angle mode using the Settings screen. These functions operate on the value in the x register and replace it with the function result (f(x)).
| Key | Function | Description | Type |
|---|---|---|---|
| SIN | sin | Sine | unary |
| COS | cos | Cosine | unary |
| TAN | tan | Tangent | unary |
| COS−1 | acos | Arccosine | unary |
| SIN−1 | asin | Arcsine | unary |
| TAN−1 | atan | Arctangent | unary |
| π | pi | Pushes the value of pi (3.14159...) onto the stack. |
|
| →DEG | deg | Radians to degrees conversion | unary |
| →RAD | rad | Degrees to radians conversion | unary |