Question

solve it please in paper​

Answer 1

Answer:

hope it will help you dear

Answer 2

Given:-

$\implies \: \cos {}^{2} ( \frac{\pi}{4} - \frac{ \theta}{2} ) - \sin {}^{2} ( \frac{\pi}{4} - \frac{ \theta}{2} )$

we know that

$\implies \pink{ \cos {}^{2} \theta - \sin {}^{2} \theta \: = \cos 2\theta}$

$\implies \cos 2( \frac{\pi}{4} - \frac{ \theta}{2} ) \\ \\ \implies \: \cos( \frac{ \cancel{2}\pi}{ \cancel{4}} - \frac{ \cancel{2}\theta}{ \cancel{2}} ) \\ \\ \implies \: \cos( \frac{\pi}{2} - \theta ) \\ \\ \implies \: \sin \theta$

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