AM-2050

Product rule

A Math · Secondary 4 · Medium · Product rule

It is given that

y = 5x\cos 3x

.
Find

\dfrac{dy}{dx}

in terms of

x

.

$5\cos 3x - 15x\sin 3x$
$5\cos 3x + 15x\sin 3x$
$5\sin 3x - 15x\cos 3x$
$5\sin 3x + 15x\cos 3x$

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