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Sec6x - tan6x = 1 + 3sec2x × tan2x - Mathematics 2 - Geometry [गणित २ - भूमिती]

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Question

sec6x - tan6x = 1 + 3sec2x × tan2x  

Sum

Solution

डावी बाजू = sec6x - tan6

= (sec2x)3 - tan6x  

= (1 + tan2x)3 - tan6x ......[∵ 1 + tan2θ = sec2θ]

= 1 + 3tan2x + 3(tan2x)2 + (tan2x)3 - tan6x .....[∵ (a + b)3 = a3 + 3a2b + 3ab2 + b3

= 1 + 3tan2x (1 + tan2x) + tan6x - tan6x

= 1 + 3tan2x sec2x ......[∵ 1 + tan2θ = sec2θ]

= उजवी बाजू

∴ sec6x - tan6x = 1 + 3sec2x × tan2x   

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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. (7) | Page 138
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