Question

Arrange the steps in the correct order to express cos3x in terms of cosx cos(2x)cos(x)-sin(2x)(x) [1-sin^2(x)]cos(x)-[2sin(x)cos(x)]sin(x) cos(x)-4sin^2(x)cos(x) 4cos^3(x)-3cos(x) cos(2x+x) cos(x){1-4[1-cos^2(x)]} cos(x)-2sin^2(x)cos(x)-sin^2(x)cos(x) cos(x)[1-4sin^2(x)] cos(x)[-3+4cos^2(x)]

Answer 1

1. cos(2x+x)

2. cos2xcos-sin2xsinx

3. 1-2sin^2x(cosx) -(2sinxcosx)sinx

4. cosx - 2sin^2xcosx - 2sin^2xcosx

5. cosx - 4sin^2xcosx

6. cosx( 1 - 4sin^2x)

7. cosx{1-4(1-cos^2x)}

8. cosx{-3+4cos^2x)

9. 4cos^3x-3cosx

Step-by-step explanation: I got this right on Edmentum