# Introduction to Trigonometry

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Evaluate: (cosec A – sin A)(sec A – cos A) = 1/(tan A + cotA)

By Satkriti Roao, 3 years ago

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162

(sin A + cosec A)^2 + (cos A + sec A)^2 = 7 + tan^2A + cot^2A

By Satkriti Roao, 3 years ago

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179

(cos A – sin A+1)/( cos A +sin A–1) = cosec A + cot A, using the identity cosec^2A = 1 + c...

By Satkriti Roao, 3 years ago

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213

Evaluate: tan θ/(1 - cot θ) + cot θ/(1 - tan θ) = 1 + sec θ cosec θ

By Satkriti Roao, 3 years ago

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173

(cosec θ – cot θ)^2 = (1-cos θ)/(1+cos θ) (ii) cos A/(1+sin A) + (1+sin A)/cos A = 2 sec A

By Satkriti Roao, 3 years ago

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