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## 1. Evaluate the following: (i) sin 20o/ cos 70o (ii) cos 19o/ sin 71o

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How do you evolve this sum using the trigonometric formulas. Class 10th, Rd sharma, Trigonometric identities.

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## 9. If tan θ = a/b, find the value of (cos θ + sin θ)/ (cos θ – sin θ)

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Explain the method used. Class 10th, Rd sharma Trigonometric identities.

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## 8. If 3cot A = 4, check whether (1–tan2A)/(1+tan2A) = (cos2A – sin2A) or not.

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Explain the question. Explain the formula question. Class 10th, rd sharma, trigonometric identities

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## 7. If cot θ = 7/8, evaluate (i) (1+sin θ)(1–sin θ)/ (1+cos θ)(1–cos θ) (ii) cot2 θ

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Explain the question. Justify the answer Class 10th, rd sharma, trigonometric identities

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## 3. In fig. 5.37, find tan P and cot R. Is tan P = cot R?

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Help with this question. Which formula used? Class 10th cbse rd sharma trigonometric identites

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## Find the value of sin48°sec42° + cos48°cosec42°.

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One of the most important and exam oriented question from trigonometric identities in which we have been asked to find ...Read more

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## Find the value of sin50°/cos40° + cosec40°/sec50° – 4cos50°cosec40°

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This is the basic and conceptual question from trigonometric identities in which we have been asked to find the value ...Read more

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## If sinθ=cos(θ-45°), where θ is an acute, find the value of θ.

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This is the basic and conceptual question from trigonometry, topic – trigonometric identities in which we have given that sinθ=cos(θ-45°) ...Read more

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## If tanA=5/12, find the value of (sinA+cosA)secA

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One of the most important and exam oriented question as it was already asked in previous year paper of 2008 ...Read more

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## Write the value of cos1°cos2°………cos180°.

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This is the basic and conceptual question from trigonometry, topic – trigonometric identities in which we have to find the ...Read more