# Math Help - sin^2(x)

1. ## sin^2(x)

is sin^2(x) = (sin(x))^2 or sin (x^2) ?

2. $\sin^2(x)=[\sin(x)]^2$ and that second way is how many calculators and computer algebra systems require it be done.
But historically the first way is preferred.

3. $\sin^2(x) = \sin(x) \sin(x) = [\sin(x)]^2$

This holds for any positive integer