Question

If sin A + sin² A = 1, then (cos² A +cos⁴ A) is:​

Answer 1

Answer:

given,

sin A + sin² A = 1

sinA=1-sin²A

sinA=cos²A

now square both sides,

sin²A=cos⁴A

1-cos²A=cos⁴A

cos²A+cos⁴A=1