Question
If $$x = a{\text{ }}\sec \theta .\cos \phi ,$$ $$y = b{\text{ }}\sec \theta .sin\phi ,$$ $$z = c{\text{ tan}}\theta {\text{.}}$$ then the value of $$\frac{{{x^2}}}{{{a^2}}}$$ + $$\frac{{{y^2}}}{{{b^2}}}$$ - $$\frac{{{z^2}}}{{{c^2}}}$$ is?
Answer: Option A
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