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If y=cos^2(x/2)then dy/dx is...

If `y=cos^2(x/2)`then `dy/dx` is

A

a) `cosx`

B

b)`1/2cosx`

C

c)`-1/2sinx`

D

d) `-sinx`

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UNITED BOOK HOUSE-THE SCOTTISH CHURCH COLLEGIATE SCHOOL-EXERCISE
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