JEE Exam  >  JEE Questions  >  Find a)π/4b)π/2c)4πd)2πC... Start Learning for Free
Find   
  • a)
    π/4
  • b)
    π/2
  • c)
  • d)
Correct answer is option 'B'. Can you explain this answer?
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Find a)π/4b)π/2c)4πd)2πCorrect answer is option '...
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Find a)π/4b)π/2c)4πd)2πCorrect answer is option '...
Using trigonometric identities, we have
cos2x=cos2x-sin2x  -(1) and cos2x+sin2x =1 -(2)
cos2x=1-sin2x , substituting this in equation (1) we get 
cos2x=1-sin2x-sin2x=1-2sin2x
So,cos2x=1-2sin2x
2sin2x=1-cos2x


 
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