Question

If cos A + cos2A=1 then sin2A + sin4A =

Answer 1

Here is your answer user.

Answer 2

Answer:

Step-by-step explanation:

Given : cos A + cos²A=1

To find : sin²A +sin4A =?

Soln :  cosA +cos²A=1

          i.e cos A = 1 - cos²A

           ∴ cos A =sin²A.       ..(sin²A +cos²A +1)

           Now,

        sin²A + sin4A = cos A + (cosA)²

                                 cosA + cos²A

                                = 1....(given)

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