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Plz solve it plz do I need it quick ​

Answer»

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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