[nb45ti]

I am trying to solve a few problems here. Any help on anyone of the following would be appreciated. Please show your work.

1. tan(2x) + sin(2x) / 2cos(x^2)

2. 2cos(pi / 4 + x)cos(pi /4 - x )

3. sin(3x) - 3sin(x) / cos(3x) + 3cos(x)