If sin x + sin^2 x = 1,
then value of cos^2
x + cos^4
x is
(A) 1 (B) 2
(C) 1.5 (D) None of these

• snx=1-sin^2x
  sinx=cos^2x
  now squaring both sides, we get
  sin^2x=cos^4x
  1-cos^2x=cos^4x
  so 1=cos^2x+cos^4x
• 10 years agoHelpfull: Yes(4) No(0)