Question

9cosec²thitha-9cot²thitha=​

Answer 1

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9cosec²thitha-9cot²thitha=

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9 cot2 θ – 9 cosec2 θ

Consider

=>9 cot2 θ – 9 cosec2 θ

=>9 (cot2 θ – cosec2 θ)

Now ∵ 1 + cot2 θ = cosec2 θ

=>cot2 θ – cosec2 θ = – 1

=>9 (cot2 θ – cosec2 θ)

= 9 ( – 1) = – 9

Answer 2

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