Please answer this very simple and easy attachment I will say what each choose is down below! The chooses have 4 options each ex
cept for the third and, you choose between them and please CORRECTLY!! First Choose, Odd, Even, Rounded, Compatible Second Choose, 30, 36, 40, 35 Third Choose, 10, 7, 6
1 answer:
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Hi there!
We are given:
cos(7x)cos(4x) = -1 - sin(7x)sin(4x)
Begin by moving all terms with variables to one side:
cos(7x)cos(4x) + sin(7x)sin(4x) = -1
The corresponding trig identity is cos(A - B). Thus:
cos(7x - 4x) = cos(7x)cos(4x) + sin(7x)sin(4x) = -1
cos(3x) = -1
cos = -1 at π, so:
3x = π
x = π/3
We can also find another solution. Let 3π = -1:
3x = 3π
x = π
Thus, solutions on [0, 2π) are π/3 and π.