So I went pretty smoothly through most of the homework questions untill I reached these ones. I'd love some quick help since I have a test on this tomorrow!

1) Find solutions on the interval [0, 2pi]:

4sinxtanx - 3tanx + 20sinx - 15 = 0

2) Use an identity to find solutions on the interval [0, 2pi]:

sec^2x - 2tan^2x = 0

Any hints/clues/help/ANSWERS would be greatly appreciated.