Question

If sina + sin2 a=1 prove cos2 a+cos4 a= 1

Answer 1

Answer:

Step-by-step explanation:ok it's done

Answer 2

Answer:

1

Step-by-step explanation:

sin A + sin ^2 A = 1

sin A = 1 - sin^2A

sin A = cos ^2 A

from above

Cos ^2 A + Cos ^4A = Sin A + Sin^2A= 1