2sin^2(2/A)+cosA=1
Please help me verify using identities
I think you mean
2sin^2(A/2)+cosA = 1
this follow directly from
cos(2x) = 1-2sin^2(x)
with x = A/2
Please help me verify using identities
2sin^2(A/2)+cosA = 1
this follow directly from
cos(2x) = 1-2sin^2(x)
with x = A/2