Question

$if \: x \: = \: \sin( \alpha ) + \cos( \alpha ) \sin(2 \alpha ) \: and \: \: y = \cos( \alpha ) + \sin( \alpha ) \sin(2 \alpha )$
prove that
${{{(x + y)}}}^{ \frac{2}{3} } + {(x - y)}^{ \frac{2}{3} } = \: 2$
​

Answer 1

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Answer 2

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