मराठी

Prove the Following Trigonometric Identities. Cot^2 a Cosec^2b - Cot^2 B Cosec^2 a = Cot^2 a - Cot^2 B

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प्रश्न

Prove the following trigonometric identities.

`cot^2 A cosec^2B - cot^2 B cosec^2 A = cot^2 A - cot^2 B`

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उत्तर

L.H.S = `cot^2 A cosec^2B - cot^2 B cosec^2 A`

`= cot^2 A(1+ cot^2 B) - cot^2   B(1 + cot^2 A)`    (∵ `1 + cot^2 theta = cosec^2 theta`)

`= cot^2 A + cot^2 A cot^2 B - cot^2 B cot^2 A`

`= cot^2 A - cot^2 B`

Hence proved

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पाठ 11: Trigonometric Identities - Exercise 11.1 [पृष्ठ ४६]

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आर.डी. शर्मा Mathematics [English] Class 10
पाठ 11 Trigonometric Identities
Exercise 11.1 | Q 72 | पृष्ठ ४६
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