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g(x) = cos x
f(g(x)) ?
f(cos x)
2(cos x)^2 - 1
2(cos^2 x) - 1
2cos^2 x - 1
CMIIW
(fog)(x) = 3x^2 - 3x + 4
f(g(x)) = 3x^2 - 3x + 4
f(x^2 - x + 3) = 3x^2 - 3x + 4
f(x^2 - x + 3) = 3x^2 - 3x + 9 - 5
f(x^2 - x + 3) = 3(x^2 - x + 3) - 5
f(x) = 3x - 5
CMIIW