f f(x) = 3 x, then f ¢(x) at x = Π 2 = is: - Vidyadip

MCQ

$f\ f(x) = 3\cos x,$ then $f ¢(x)$ at $ \text{x} = \frac{Π}{2}$ = is:

✓
$-3$
B
$3$
C
$0$
D
$-1$

✓

Answer

Correct option: A.

$-3$

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