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(secθ - cosθ)(cotθ + tanθ) = tanθ secθ - Mathematics 2 - Geometry [गणित २ - भूमिती]

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Question

(sec θ - cos θ)(cot θ + tan θ) = tan θ sec θ

Sum

Solution

डावी बाजू = (sec θ - cos θ)(cot θ + tan θ)

= `(1/cos θ - cos θ) (cos θ/sin θ + sin θ/cos θ)`

= `((1 - cos^2θ)/cos θ)((cos^2θ + sin^2θ)/(sinθcosθ))`

= `sin^2θ/cosθ xx 1/(sinθcosθ)` ....`[(∵ sin^2θ + cos^2θ = 1),(∴ sin^2θ = 1 - cos^2θ)]` 

= `sinθ/cosθ . 1/cosθ`

= tan θ . sec θ

= उजवी बाजू

∴ (sec θ - cos θ)(cot θ + tan θ) = tan θ sec θ 

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त्रिकोणमितीय नित्यसमानता
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Chapter 6: त्रिकोणमिती - सरावसंच 6.1 [Page 132]

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Balbharati Geometry (Mathematics 2) [Marathi] 10 Standard SSC Maharashtra State Board
Chapter 6 त्रिकोणमिती
सरावसंच 6.1 | Q 6. (4) | Page 132
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