Hello yaykittyeeeInverse trig functions are always a pain. Get rid of them as soon as you can. Here's the first one:

Let . So

Let . So

And the original equation becomes:But

So

Solve this for by squaring both sides. You get a quadratic, one of whose roots is not valid. The other is the answer to the question (which is ).

Number 2 is a bit trickier, but start it in the same way. Let:i.e.Then say:

i.e.

i.e.and:Then solve the equation in .

(substitute to get everything in terms of )

Do you want to have another go now?

Grandad