हिंदी

If tan θ = 1/sqrt(7) then prove that ((cosec^2θ + sec^2θ))/((cosec^2θ – sec^2θ)) = 4/3.

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प्रश्न

If `tan θ = 1/sqrt(7)` then prove that `(("cosec"^2θ + sec^2θ))/(("cosec"^2θ - sec^2θ)) = 4/3`.

प्रमेय
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उत्तर

Given: `tan θ = 1/sqrt(7)`

To prove: `(("cosec"^2θ + sec^2θ))/(("cosec"^2θ - sec^2θ)) = 4/3`

Proof:

sec2θ = (1 + tan2θ)

= `(1 + 1/7)`

= `8/7`

cosec2θ = (1 + cot2θ)

= (1 + 7)

= 8

∴ `(("cosec"^2θ + sec^2θ))/(("cosec"^2θ - sec^2θ)) = ((8 + 8/7))/((8 - 8/7))`

= `64/48`

= `4/3`

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अध्याय 10: Trignometric Ratios - EXERCISE 10 [पृष्ठ ५४७]

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आर.एस. अग्रवाल Mathematics [English] Class 10
अध्याय 10 Trignometric Ratios
EXERCISE 10 | Q 18. | पृष्ठ ५४७
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