I got my math study guide today and everything looks like arabic

I need help on pretty much all of it, but this is what I'm asking about for now:

1.) Find all the radian solutions for the following equation: 4sin^2 x - 1=0

2.) Simplify the following expression by using a double-angle formula or a half-angle formula: 1-2sin^2 (x/12)

3.) Find the quotient z1/z2 in trigonometric form, if z1=cos(pie) +i sin(pie)and z2=5cos(pie/2) + 5i sin(pie/2)