I have to solve for X and am not sure where to start

questions:

cos2x +sin (squared root) x=0

where: sin(squared root) =1-cos(squared root)x

and

2 sin 4x + csc 4x =3

where csc=1/sinx

please, if anyone can give me a hand it would be much appreciated. Also, as I am a new user, could someone tell me where to find a squared root symbol?