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Question
`tanθ/(secθ + 1) = (secθ - 1)/tanθ`
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Solution
डावी बाजू = `tanθ/(secθ + 1)`
= `tanθ/(secθ + 1) xx (secθ - 1)/(secθ - 1)` ..............[छेदाचे परिमेयकरण करून]
= `(tanθ(secθ - 1))/(sec^2θ - 1)`
= `(tanθ(secθ - 1))/(tan^2θ)` .....`[(∵ 1 + tan^2θ = sec^2θ), (∴ sec^2θ - 1 = tan^2θ)]`
= `(secθ - 1)/(tanθ)`
= उजवी बाजू
∴ `tanθ/(secθ + 1) = (secθ - 1)/tanθ`
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