I know I'm a bother but can you guys help me again?
I'm having trouble with these ones. Thanks!
1. find the exact solutions algebraically in the interval [0, 2pi)
sin 2x sin x = cos x. (2 is not an exponent on this one)
2. verify identity algebraically
cos^4 x - sin^4 x = cos 2x.
3. find all solutions of the equation in the interval [0, 2pi)
sin(x + pi/6) - sin(x - pi/6) = 1/2