If sin A + sin² A =1:

If sin A + sin² A =1, then the value of cos² A + cos4 A is

  1. 3/2
  2. 1
  3. 2
  4. 5/3
Anurag Mishra Professor Asked on 26th October 2015 in Maths.
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1 Answer(s)

Answer is (2) 1

Explanation:- 
Sin A + Sin2A = 1
Sin A = 1 – Sin2A
Sin A = Cos2A

Cos2A + (Cos2A)2
Put the value of Cos2A = Sin A

Then, Cos2 A + Sin2A = 1

Hence, the answer is (2) 1

Monis Rasool Professor Answered on 28th October 2015.
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