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जर sin θ + cos θ = 3, तर tan θ + cot θ = 1 हे दाखवा. - Mathematics 2 - Geometry [गणित २ - भूमिती]

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Question

जर sin θ + cos θ = `sqrt(3)`, तर tan θ + cot θ = 1 हे दाखवा.

Sum

Solution

sin θ + cos θ = `sqrt(3)`     ......[दिलेले]

∴ (sin θ + cos θ)2 = 3    ......[दोन्ही बाजूंचे वर्ग करून]

∴ sin2θ + 2sinθ cosθ + cos2θ = 3  ......[∵ (a + b)2 = a2 + 2ab + b2]

∴ (sin2θ + cos2θ) + 2sinθ cosθ = 3

∴ 1 + 2 sin θ cos θ = 3   ......[∵ sin2θ + cos2θ = 1]

∴ 2 sin θ cos θ = 2

∴ sin θ cos θ = 1   ......(i)

tan θ + cot θ = `sintheta/costheta + costheta/sintheta`

= `(sin^2theta + cos^2theta)/(costhetasintheta)`

= `1/(sintheta costheta)`   ......[∵ sin2θ + cos2θ = 1]

= `1/1`    ......[(i) वरून]

= 1

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Chapter 6: त्रिकोणमिती - Q ५)

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Chapter 6 त्रिकोणमिती
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