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Prove that θθθθcosec2θ-sec2θcosec2θ+sec2θ=34, if tan θ = 17 - Mathematics

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प्रश्न

Prove that `(cosec^2 θ - sec^2 θ)/(cosec^2 θ + sec^2 θ) = 3/4,` if tan θ = `1/sqrt7`

योग

उत्तर

L.H.S = `(cosec^2 θ - sec^2 θ)/(cosec^2 θ + sec^2 θ)`

= `(1 + cot^2 θ - 1 - tan^2 θ)/(1 + cot^2 θ + 1 + tan^2 θ)`

= `(cot^2 θ - tan^2 θ)/(2 + cot^2 θ + tan^2 θ)`

= `(7 - 1/7)/(2 + 1/7 + 7)`

= `((49 - 1)/7)/((63 + 1)/7)`

= `48/64`

= `3/4`

= R.H.S

Hence Proved

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2023-2024 (February) Standard - Outside Delhi Set 3
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