Question

value of
$sin {}^{2} 75 - sin {}^{2} 15$
​

Answer 1

$= > \sin {}^{2} 75 - \sin {}^{2} 15 \\ = > \sin {}^{2} 75 - \sin {}^{2} (90 - 15) \\ = > \sin {}^{2}75 - \cos {}^{2}75 \\ = > 1$

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