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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.

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Anurag Mishra Professor Answered on 8th July 2015.
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