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If `x= a(cos t + tsin t), y= a(sin t- t cos t)`, then `dy/dx` .............. A) cot t B) -tan t C) `sqrt (tan t)` D) tan t

A

cot t

B

-tan t

C

`sqrt (tan t)`

D

tan t

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CHETANA PUBLICATION-Differentiation-Exercise
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