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= (1 + tan square A ) ( 1 + cot square A )
= sec square A × cosec square A
= 1/ Cos square A × 1 / sin square A
= 1 / 1 - sin square A ( sin square A )
= 1 / sin square A - sin four A
= Hence proved
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= sec square A × cosec square A
= 1/ Cos square A × 1 / sin square A
= 1 / 1 - sin square A ( sin square A )
= 1 / sin square A - sin four A
= Hence proved
please mark as brainliest if you like so
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