Question

If sina+sin^2a=1then the value of cos^2a+os^4a is

Answer 1

Given sin a + sin^2 a = 1

           sin a = cos^2 a

 Squaring on both sides, we get
 
           sin^2 a = cos^ 4 a    ---- (1).

Given cos^2a + cos^4a

          cos^2a + sin^2a = 1.(from (1)


Hope this helps!