In Problem, try to fill in the blanks without referring back to the text.
From (cos θ + i sin θ)4 = cos 4θ + i sin 4θ we get the real trigonometric identities cos 4θ = ______ and sin 4θ = ______.
We need at least 10 more requests to produce the solution.
0 / 10 have requested this problem solution
The more requests, the faster the answer.