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= tan x
f'(x) =
f'( =
=
=
= 2
9) P(x) = cos x . tan x
= cos x .
= sin x
P'(x) = cos x
10) g(x) = (2 - 3x)
g'(x) = 5 (2 - 3x) . -3 .sec² (2 - 3x)
= - 15 (2 - 3x) .sec² (2 - 3x)