How to Use pow Function in C for Trigonometric Expressions?

[pairofstrings]

Hello.
How to write
1. sin²(x)
2. sin(x²)
3. (sin(x))²
by using predefined function pow defined in math.h in C language?
Are they all same?

Thank you.

 

[Drakkith]

1 and 3 are identical. Sin²(x) = sin(x) * sin(x) = (sin(x))².

The power function in the C math.h library is defined as: double pow( double x, double y), where x is raised to the power of y.
So you'll pass to the function sin(x) or x along with a two.

 

[Mark44]

Hello.
How to write
1. sin²(x)
2. sin(x²)
3. (sin(x))²
by using predefined function pow defined in math.h in C language?
Are they all same?

Thank you.

Since all of these expressions involve only the power 2, you can get the same result by multiplying instead of using the pow() function. For #2 above, sin(x^2) is the same as sin(x * x), but the latter form takes considerably less time to compute.