Question

If Cos2 64 +Cos2 A=1 then the angle A is_____​

Answer 1

Answer:

it is Given that cosA+cos

2

A=1⇒cosA=1−cos

2

A⇒cosA=sin

2

Now, sin

2

A+sin

4

A=sin

2

A+(sin

2

A)

2

=sin

2

A+cos

2

A=1 (1)

Therefore, Answer is 1