Prove the following- cos-4-xcos-4-y-sin-4-xsin-4-y-sinx-y

LHS= cos( π #160;/ 4 x ) cos( π #160;/ 4 y ) sin( π #160;/ 4 x ) sin( π #160;/ 4 y ) =cos( π #160;/ 4 x+π #160;/ 4 y ) #160; Us ...

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Trigonometric Ratios of Allied Angles

Prove the fol...

Question

Prove the following:
$c o s (\frac{π}{4} - x) c o s (\frac{π}{4} - y) - s i n (\frac{π}{4} - x) s i n (\frac{π}{4} - y) = s i n (x + y)$

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