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1+sinBcos B+cos B1+sinB = 2 sec B हे सिद्ध करा. - Mathematics 2 - Geometry [गणित २ - भूमिती]

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Question

`(1 + sin "B")/"cos B" + "cos B"/(1 + sin "B")` = 2 sec B हे सिद्ध करा.

Sum

Solution

डावी बाजू = `(1 + sin "B")/"cos B" + "cos B"/(1 + sin "B")`

= `((1 +sin "B")^2 + cos^2"B")/(cos "B"(1 + sin "B"))`

= `(1 +2sin"B" + sin^2"B" + cos^2"B")/(cos"B"(1 + sin"B"))`    ......[∵ (a + b)2 = a2 + 2ab + b2

= `(1 + 2sin"B" + 1)/(cos"B"(1+ sin"B"))`   .....[∵ sin2B + cos2B = 1]

= `(2 + 2sin"B")/(cos"B"(1 + sin"B"))`

= `(2(1 + sin"B"))/(cos"B"(1 + sin"B"))`

= `2/"cos B"`

= 2 sec B

= उजवी बाजू 

∴ `(1 + sin "B")/"cos B" + "cos B"/(1 + sin "B")` = 2 sec B

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Chapter 6: त्रिकोणमिती - Q ३ ब)

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Chapter 6 त्रिकोणमिती
Q ३ ब) | Q १७.
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