Answer:
Step-by-step explanation:
use the formula { a couple of times} cos 2 Θ = 2 cos ² Θ - 1 = 1 - 2 sin ² Θ....your answer will likely have a cos 2x , a cos 4x , and a cos 6x in it.....note : cos ² Θ - sin ²Φ = cos ( Θ + Φ) cos (Θ - Φ) will also be needed for appropriate choices of Θ & Φ in terms of x
(6d^2 + 27d - 10d - 45)
= (6d^2 + 17d - 45)
Answer:
5x
Step-by-step explanation:
6x/2+2x=3x+2x=5x
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