# Thread: trig identities

1. ## trig identities

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?

2. Originally Posted by muffin353
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?
2. Multiply everything out by $\sin{4x}$ to get a quadratic equation that you can solve.

Once you're in LaTeX mode, the code for a square root is

sqrt{}

and whatever is underneath the square root symbol goes inside the curly brackets.