Question

1
If Sina+ Sin2A=1, then the
value of (Cos2A + Cos4

A) is!
Solm​

Answer 1

Answer:

sinA+sin2 =1

sinA=1−sin2A

sinA=cos2A

Now cos 2A+cos 2

A.cos

2

A

=sinA+sin

2

A

=1 ...