Math Is Fun Forum

Hello,
I'm having trouble with a few trig. problems. If someone could help me out it would be great!

1. Find the value of x given 2 sin^-1 x= -pi

2. suppose tan(angle) = t . Prove that sin2(angle) = [2t] / [1+t^2]

3. Given sin(angle)=0.3, find the value of sec(angle)

Thats all for now.

All help would be appreciated.

Thanks