यदि `x = a sec alpha cos beta, y = b sec alpha sin beta, z = c tan alpha,` हो `(x^(2))/(a^(2)) + (y^(2))/(b^(2)) - (z^(2))/(c^(2))` का मान क्या होगा ?

Options

A. 2
B. 0
C. 1
D. `-1`

Answer

C