AM-2193

Product rule

A Math · Secondary 4 · Easy · Product rule

It is given that

y=3x\cos2x

. Find

\dfrac{dy}{dx}

in terms of

x

.

$3\cos2x-6x\sin2x$
$3\cos2x+6x\sin2x$
$3x(-2\sin2x)$
$3\cos2x$

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