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Cot A1-cotA+tan A1-tanA = – 1 हे सिद्ध करा. - Mathematics 2 - Geometry [गणित २ - भूमिती]

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Question

`"cot A"/(1 - cot"A") + "tan A"/(1 - tan "A")` = – 1 हे सिद्ध करा.

Sum

Solution

डावी बाजू = `"cot A"/(1 - cot"A") + "tan A"/(1 - tan "A")`

= `"cot A"/(1 - 1/(tan"A")) + "tan A"/(1 - tan "A")`

= `"cot A"/((tan "A" - 1)/(tan "A")) + "tan A"/(1 - tan "A")`

= `"cot A tan A"/(tan "A" - 1) + "tan A"/(1 - tan "A")`

= `1/(tan "A" - 1) + "tan A"/(1 - tan "A")`   ......[∵ cot A tan A = 1]

= `- 1/(1 - tan "A") + "tan A"/(1 - tan "A")`

= `- (1/(1 -tan "A") - "tan A"/(1- tan "A"))`

= `-((1 - tan "A")/(1 - tan "A"))`

= – 1

= उजवी बाजू 

∴ `"cot A"/(1 - cot"A") + "tan A"/(1 - tan "A")` = – 1

shaalaa.com
कोसेक, सेक आणि कॉट गुणोत्तरे (cosec, sec and cot ratios)
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Chapter 6: त्रिकोणमिती - Q ३ ब)

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SCERT Maharashtra Geometry (Mathematics 2) [Marathi] 10 Standard SSC
Chapter 6 त्रिकोणमिती
Q ३ ब) | Q ९.
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