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Find the tangent to the curve `y = cos (x + y), 0 le x le 2pi` which is parallel to the line x + 2y = 0

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SHARAM PUBLICATION-QUESTION PAPER 2015-EXERCISE
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  13. Evaluate: int(dx)/(cosx(1+2sinx))

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  14. Find the tangent to the curve y = cos (x + y), 0 le x le 2pi which is ...

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