Question

Im having difficulty with these problems. Can someone please help me out?

1) Solve 2cos x=1
2) Solve: tan x -2sin x tan x=0
3) Solve: cos (2x)= -3^(1/2)/2

Answer 1

x=60° or 300°

Explanation:

2cosx=1

cosx=1/2

cosx=cos60°,cos(360-60)°

cosx=cos60,cos300

either,

cosx=cos60

x=60

or,

cosx=cos300

x=300