Question

plz solve it plz do I need it quick ​

Answer 1

$we \: know \: that \: (1 + { \cot ^{2} \alpha }) = {cosec}^{2} \alpha \\ (1 + \cot ^{2} 2x ) \sin^22x = ({cosec}^{2} 2x)(sin^22x) \\ = \frac{1}{sin^22x} \times sin^22x \\ = 1$

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