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Question
`sqrt((1 - sinθ)/(1 + sinθ))` = secθ - tanθ
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Solution
डावी बाजू = `sqrt((1 - sinθ)/(1 + sinθ))`
= `sqrt((1 - sinθ)/(1 + sinθ) xx (1 - sinθ)/(1 - sinθ))` .....[छेदाचे परिमेयकरण करून]
= `sqrt((1 - sinθ)^2/(1 - sin^2θ)`
= `sqrt((1 - sinθ)^2/cos^2θ)` ...`[(∵ sin^2θ + cos^2θ = 1), (∴ 1 - sin^2θ = cos^2θ)]`
= `(1 - sinθ)/(cosθ) = 1/cosθ - sinθ/cosθ`
= sec θ - tan θ
= उजवी बाजू
∴ `sqrt((1 - sinθ)/(1 + sinθ))` = sec θ - tan θ
APPEARS IN
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cot2θ × sec2θ = cot2θ + 1 हे सिद्ध करा.
tan2θ – sin2θ = tan2θ × sin2θ हे सिद्ध करण्यासाठी खालील कृती पूर्ण करा.
कृती: डावी बाजू = `square`
= `square (1 - (sin^2theta)/(tan^2theta))`
= `tan^2theta (1 - square/((sin^2theta)/(cos^2theta)))`
= `tan^2theta (1 - (sin^2theta)/1 xx (cos^2theta)/square)`
= `tan^2theta (1 - square)`
= `tan^2theta xx square` .....[1 – cos2θ = sin2θ]
= उजवी बाजू
`(tan(90 - theta) + cot(90 - theta))/("cosec" theta)` = sec θ हे सिद्ध करा.
`sintheta/(sectheta+ 1) +sintheta/(sectheta - 1)` = 2 cot θ हे सिद्ध करा.
sin θ (1 – tan θ) – cos θ (1 – cot θ) = cosec θ – sec θ हे सिद्ध करा.
(sin A + cos A) (cosec A – sec A) = cosec A . sec A – 2 tan A हे सिद्ध करा.
