Determine if True or False

A. sin(sin inverse x) = x for all real numbers x

Not sure...(what is it asking?)sin of sin inverse x(can any explain what this means?)

B. The graph of y = tan inverse x has two horizontal asymptotes

True...i am sure

C. 2cosxsinx - cosx = 0

Find X between [0,2pi)

x = pi/2, 3pi/2

I am also sure about number 3.

Wanted to check.

Thanks for any help...