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If f(x) = cos x and g(x) = 3x^2, then gof(x) equals
A3 cos 2x
B3 cos^2 x
Ccos^2 (3x)
Dcos(3x^2)
Answer & Solution
Correct answer: B. 3 cos^2 x
gof(x) = g(cos x) = 3(cos x)^2 = 3 cos^2 x.
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