Jika f(x) = cos2 2x – tan2 x, nilai f’(π/4) =
Jika f(x) = cos2 2x – tan2 x, nilai f’(π/4) = ….
A. 4
B. 2
C. 1
D. -2
E. -4
Pembahasan:
f(x) = cos2 2x – tan2 x
Jawaban: E
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