sinx+sin2x=1 then cos2x+cos4x=?

• If u mean
  
  Sin2x as (sinx)^2, then
  
  sinx+sin2x=1 or sinx+(sinx)^2=1
  
  sinx=1-sin2x
  
  sinx=cos2x(squaring both the sides)
  
  sin2x=cos4x
  
  1-cos2x=cos4x
  
  1=cos4x+cos2x
  
• 10 years agoHelpfull: Yes(1) No(0)
• put the value of x=90
  first equation satisfy then put second ans-1
• 10 years agoHelpfull: Yes(0) No(0)