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Questions  

Number of values of x[0,5π] and satisfying sin2x=cos2x is 

a
5
b
10
c
20
d
40

detailed solution

Correct option is B

tan2⁡x=1⇒tan⁡x=±1tan⁡x=1⇒x=π4,5π4,9π4,13π4,17π4and tan⁡x=−1⇒x=3π4,7π4,11π4,15π4,19π4Thus, there are 10 values of x.

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