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sum(r=1)^n (cos(2r x))/sin(r x+pi/4)=((2...

`sum_(r=1)^n (cos(2r x))/sin(r x+pi/4)=((2sin50 x)/sin(x/2))sin(pi/4-(m x)/2)` then

A

`2npi+(pi)/(4)`

B

`2npi+(pi)/(3)`

C

`2npi+(pi)/(6)`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
c
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FIITJEE-TRIGONOMETIC EQUATIONS -ASSIGNMENT PROBLEMS (OBJECTIVE) (LEVEL 1)
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