Q. 165.0( 3 Votes )

Mark the correct A. 7

B. 8

C. 9.5

D. 10

Answer :


We know that sin(90-x) =cos x

So sin2(90-x)= cos2x


And sin2x+cos2x= 1

So, in given series on rearranging terms we get 8 cases where sin2x+cos2x= 1

So, given changes to


= 9.5

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