if cos A+cos2 A =1, then sin2 A +sin4 A is

Given, cos A+cos2 A =1

⇒cos A =1 - cos2 A

⇒cos A = sin2 A ... (1)

Now, sin2 A +sin4 A = cos A + cos2 A [using (1)]

= 1

  • 4
What are you looking for?