Solve the Equation Given Below

If sinθ+sin2θ=1, then the value of cos2θ +cos4θ is:

  1. 2
  2.  0
  3.  1
  4.  -1
Monis Rasool Professor Asked on 8th July 2015 in Maths.
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  • 1 Answer(s)

    Answer: (3) 1
    Explanation:-
    sinq + sin2q = 1                   …………………… (1)
    sinq = 1 – sin2q
    sinq = cos2q
    Now, cos2q + cos4q
    Put, cos2q = sinq
    Then, sinq + sin2q =     from equation (1) .

    Hence, the answer is (3) 1.

    Anurag Mishra Professor Answered on 8th July 2015.
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