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(sec θ + tan θ) (1 - sin θ) = cos θ - Mathematics 2 - Geometry [गणित २ - भूमिती]

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Question

(sec θ + tan θ) (1 - sin θ) = cos θ

Sum

Solution

डावी बाजू = (sec θ + tan θ) (1 - sin θ)

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

= `((1 + sin θ)/(cos θ))(1 - sin θ)`

= `(1  - sin^2θ)/(cos θ)`

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

= cos θ

= उजवी बाजू

∴ (sec θ + tan θ) (1 - sin θ) = cos θ 

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त्रिकोणमितीय नित्यसमानता
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Chapter 6: त्रिकोणमिती - संकीर्ण प्रश्नसंग्रह 6 [Page 138]

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Balbharati Geometry (Mathematics 2) [Marathi] 10 Standard SSC Maharashtra State Board
Chapter 6 त्रिकोणमिती
संकीर्ण प्रश्नसंग्रह 6 | Q 5. (2) | Page 138
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