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Prove the following identities: cot^4A-...

Prove the following identities: `cot^4A-1=cos e c^4A-2cos e c^2A`

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RHS `= cosec^{4} A-2 cosec^{2} A `

`Rightarrow cosec^{4} A-2 cosec^{2} {A}+1-1`

`Rightarrow(cosec^{2} A-1)^{2}-1 `

`Rightarrow (cot ^{2} A)^{2}-1 `

`Rightarrow cot ^{4} A-1`

= LHS
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RD SHARMA-TRIGONOMETRIC IDENTITIES-All Questions
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