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if y=cos^2(x/2)the value of dy/dx is...

if `y=cos^2(x/2)`the value of dy/dx is ___

A

a)cosx

B

b)1/2cosx

C

c)-1/2sinx

D

d)-sinx

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UNITED BOOK HOUSE-ANNUAL EXAMINATION QUESTION PAPERS 2017-EXERCISE
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