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Question
`sec"A"/(tan "A" + cot "A")` = sin A हे सिद्ध करा.
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Solution
डावी बाजू = `sec"A"/(tan "A" + cot "A")`
= `sec"A"/((sin"A")/(cos"A") + (cos"A")/(sin"A"))`
= `sec"A"/((sin^2"A" + cos^2"A")/(cos"A" sin"A"))`
= `sec"A"/(1/(cos"A" sin"A"))` ......[∵ sin2A + cos2A = 1]
= sec A cos A sin A
= `1/cos"A" xx cos "A" sin "A"`
= sin A
= उजवी बाजू
∴ `sec"A"/(tan "A" + cot "A")` = sin A
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sec4A(1 - sin4A) - 2tan2A = 1
`tanθ/(secθ - 1) = (tanθ + secθ + 1)/(tanθ + secθ - 1)`
`tanθ/(secθ + 1) = (secθ - 1)/tanθ`
जर tan θ + cot θ = 2, तर tan2θ + cot2θ = ?
sec2θ + cosec2θ = sec2θ × cosec2θ हे सिद्ध करा.
`(cos^2theta)/(sintheta) + sintheta` = cosec θ हे सिद्ध करा.
`costheta/(1 + sintheta) = (1 - sintheta)/(costheta)` हे सिद्ध करा.
`(sintheta + "cosec" theta)/sin theta` = 2 + cot2θ हे सिद्ध करा.
cotθ + tanθ = cosecθ × secθ हे सिद्ध करण्यासाठी खालील कृती पूर्ण करा.
कृती:
डावी बाजू = cotθ + tanθ
= `costheta/sintheta + square/costheta`
= `(square + sin^2theta)/(sintheta xx costheta)`
= `1/(sintheta xx costheta)` ......`because square`
= `1/sintheta xx 1/costheta`
= `square xx sectheta`
डावी बाजू = उजवी बाजू
