Question

solve for x over the inverval [0, 2π)

1) cos²x+ 2cosx-3 =0

2) (tanx-1) (cosx+1) =0

3)3sec3x-2√3 =0

Answer 1

please answer at least one! :)

Answer 2

4*cos(2x)*sin(2x) = 1

First we will divide by 2 .

==> 2cos(2x)*sin(2x) = 1/2................(1)