I'm in a hurry and I need some help with solving for the variable in these functions. I've already tried doing them all myself but I can't get the answer.

Here are the problems:

1. -t^(1/3) + (8/3) - 1/3(t) = 0

2. -2sint + 2cos2t = 0

3. e^(x^2/8)-x^(6/8)8*e^(x^2/8)