Question

2cos(3x-pi/4)=-sqrt3 find all solutions.

Answer 1

\[2\cos(3x-\frac{ \pi }{ 4 })=-\sqrt{3}\]

Answer 2

Start by dividing by 2.

Answer 3

You get cos(3x-pi/4)=-sqrt3/(2)

Answer 4

3x-pi/4=arccos(-sqrt3/2)

Answer 5

You following?

Answer 6

would I not use cos(A+B)=cosAcosB-sinAsinB?

Answer 7

You could use that if you feel comfortable using that formula.