Question

solve over 0 13 years ago

Answer 1

Hint: sin^2 = 1-cos^2

Answer 2

with the 2 would it become 2-2cos^2x on the left?

Answer 3

correct

Answer 4

you now have this

2-2cos^2x = 3cosx+3

Answer 5

if you let u = cos x, then u^2 = cos^2x

Answer 6

giving you

2 - 2u^2 = 3u + 3

Answer 7

solve that for u, then use those solutions to find the solutions for x