Okay so i have two problems that I cant solve completely.

One is a a word problem

1. A sharpshooter intends to hit a target at a distance of 1000yardswith a rifle having a muzzle velocity of vo=1200feet per second. Neglecting air resistance, determine the gun's minimum angle of elevation x if the range r is given by

r=(1/32)vo^2(sin(2x))

I can solve this problem down to 1/15 = sin(2x) (assuming i did this much right).

My second problem is:

Solve tan(x+pi)+2sin(x+pi)=0 i started to solve this using the sum and difference formulas.

If anyone could help that would be great. Thanks

AC