Cos^4a - sin^4 A = cos 2 A
Answers
Answered by
0
Answer:
cos
4
A−cos
2
A=sin
4
A−sin
2
A
LHS.
=cos
2
A(1−cos
2
A)
=cos
2
Asin
2
A[∵sin
2
A+cos
2
A=1]
RHS
=sin
2
A(1−sin
2
A)
=sin
2
Acos
2
A[∵sin
2
A+cos
2
A=1]
=cos
2
Asin
2
A
LHS=RHS
Similar questions