8. If cos A =
then find the value of cos 2A.
Answers
Answered by
0
Answer:
what is the value of cosA
Answered by
0
it is Given that cosA+cos
2
A=1⇒cosA=1−cos
2
A⇒cosA=sin
2
A.............(1)
Now, sin
2
A+sin
4
A=sin
2
A+(sin
2
A)
2
=sin
2
A+cos
2
A=1 (from (1))
Therefore, Answer is 1
Similar questions