Mathematics
For \(0 < \phi < \frac{\pi}{2}\), if
\(x = \sum_{n = 0}^{\infty}\mspace{2mu}\cos^{2n}\phi,y = \sum_{n = 0}^{\infty}\mspace{2mu}\sin^{2n}\phi\)
and
\(z = \sum_{n = 0}^{\infty}\mspace{2mu}\cos^{2n}\phi\sin^{2n}\phi\),
then
A
\(xyz = xz + y\)
B
\(xyz = xy + z\)
C
\(xyz = x + y + z\)
D
\(xyz = yz + x\)
Select an option to instantly check whether it is correct or wrong.
