AM-2696

Addition formulae

A Math · Secondary 4 · Medium · Addition formulae

Angles

A

and

B

are acute and satisfy

\sin(A+B)=\frac{3}{5}

and

\sin A\cos B = \frac{1}{4}

. Find

\cos A\sin B

.

$\dfrac{7}{20}$
$\dfrac{11}{20}$
$\dfrac{3}{20}$
$\dfrac{5}{12}$

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