Hi guys

Its revision time, and I've been going through previous papers for the module. One cropped up asking for an angle, given $\displaystyle sin^2(x)=0.64$. I know how I'd go about it if it was simply sin... but i just dont know the inverse of $\displaystyle sin^2 (x)$!!

None of my coursemates know either, but I cant ignore it and hope it doesnt come up really!

Any help on the matter would be appreciated!

Thanks