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Question

cosec6θcot6θ=1+3cot1θ+3cot4θ

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Solution

cosec6θcot6θ=(cosec2θ)3(cot2θ)3(a3b2=(ab)(a2+ab+b2))=(cosec2θ+cot2θ)(cosec4θ+cosec2θcot2θ+cot4θ)=(1+/cot2θ/cos2θ)(cosec4θ)+(1+coT2θ)cot2θ+cot4θ=(1+cot2θ)2+cot2θ+cot4θ+cot4θ1+cot4θ+2cot2θ+cot2θ+2cot4θ=1+3cot2θ+3cot4θ

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