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सिद्ध कीजिए कि cosecsec2θ+cosec2θ=tanθ+cotθ है। - Mathematics (गणित)

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Question

सिद्ध कीजिए कि `sqrt(sec^2 theta + "cosec"^2 theta) = tan theta + cot theta` है।

Sum
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Solution

L.H.S = `sqrt(sec^2 theta + "cosec"^2 theta)`

= `sqrt(1/cos^2 theta + 1/(sin^2 theta))`  ...`[∵ sec^2 theta = 1/(cos^2 theta) "and"  "cosec"^2 theta = 1/(sin^2 theta)]`

= `sqrt((sin^2 theta + cos^2 theta)/(sin^2 theta * cos^2 theta))`

= `sqrt(1/(sin^2 theta * cos^2 theta))`  ...[∵ sin2θ + cos2θ = 1]

= `1/(sin theta * cos theta)`

= `(sin^2 theta + cos^2 theta)/(sin theta * cos theta)`  ...[∵ 1 = sin2θ + cos2θ]

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

= `sintheta/costheta + cos theta/sintheta`  ...`[∵ tan theta = sin theta/cos theta "and" cot theta = costheta/sin theta]`

= tan θ + cot θ 

= R.H.S

अतः सिद्ध हुआ।

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त्रिकोणमितीय सर्वसमिकाएँ
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Chapter 8: त्रिकोणमिति का परिचय और उसके अनुप्रयोग - प्रश्नावली 8.4 [Page 101]

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NCERT Exemplar Mathematics [Hindi] Class 10
Chapter 8 त्रिकोणमिति का परिचय और उसके अनुप्रयोग
प्रश्नावली 8.4 | Q 2. | Page 101
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