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सिद्ध कीजिए। tanθsecθ+1=secθ-1tanθ - Mathematics 2 - Geometry [गणित २ - ज्यामिति]

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Question

सिद्ध कीजिए। 

`tantheta/(sectheta + 1) = (sectheta - 1)/tantheta`

Sum

Solution

बायाँ पक्ष = `tantheta/(sectheta + 1)`

= `(tantheta xx tantheta)/((sectheta + 1) xx tantheta)`

= `tan^2theta/((sectheta + 1) xx tantheta)`

= `((sec^2theta - 1))/((sectheta + 1) xx tantheta)` ...............`[(∵ 1 + tan^2theta = sec^2theta),(∴ sec^2theta - tan^2theta = 1)]`

= `((sectheta - 1)(sectheta +  1))/((sectheta + 1) xx tantheta)` ...............[a2 - b2 = (a - b)(a + b)]

= `(sectheta - 1)/tantheta` = दायाँ पक्ष

∴ बायाँ पक्ष = दायाँ पक्ष

∴ `tantheta/(sectheta + 1) = (sectheta - 1)/tantheta`.

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त्रिकोणमितीय सर्वसमिकाएँ
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Chapter 6: त्रिकोणमिति - प्रकीर्ण प्रश्नसंग्रह 6 [Page 138]

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Balbharati Geometry (Mathematics 2) [Hindi] 10 Standard SSC Maharashtra State Board
Chapter 6 त्रिकोणमिति
प्रकीर्ण प्रश्नसंग्रह 6 | Q 5. (8) | Page 138
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