Question

prove that cot^4_1=cosec^4A_2cosec^2A​

Answer 1

hello ✌✌ (GM ji)

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❤❤❤❤ HERE IS UR ANSWER ❤❤❤❤

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${ \csc(a) }^{4} - 2 { \csc(a) }^{4} = { \cot(a) }^{4}$

$lhs = { \csc(a) }^{2} ( { \csc(a) }^{2} - 2)$

$(1 + { \cot(a) }^{2} )(1 + { \cot(a) }^{2} - 2)$

$(1 + { \cot(a) }^{2})( - 1 + { \cot(a) }^{2} )$

$- 1 + { \cot(a) }^{2} - { \cot(a) }^{2} + { \cot(a) }^{4}$

$- 1 + { \cot(a) }^{4}$

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