Given the equation:
cos²(x) + 9cos(x) = 5cos(x) + 5
cos²(x) + 9cos(x) - 5 cos(x) - 5 = 0
cos²(x) + 4cos(x) - 5 = 0
[cos(x) + 5][cos(x) - 1] = 0
cos (x) = - 5 x ∉ ℝ; so:
cos (x) = 1
Then;
x = 0, and x = 2π
Well 2/3 = .66
and
5 1/2 = 5.5
Answer:
72 degrees
Step-by-step explanation:
180-36=144
144/2=72
Answer:
Step-by-step explanation:
common factor of 2a² and 10ab= 2a