If \( \mathrm{x}=\mathrm{p}(\sec \theta+\tan \theta) \) and \( \mathrm{y}=\mathrm{q}(\sec \theta... VIDEO
If \( \mathrm{x}=\mathrm{p}(\sec \theta+\tan \theta) \) and \( \mathrm{y}=\mathrm{q}(\sec \theta-\tan \theta) \), then
a. \( x y-p q=0 \)
b. \( x y+p q=0 \)
c. \( \frac{\mathrm{x}}{\mathrm{p}}+\frac{\mathrm{y}}{\mathrm{q}}=0 \)
d. \( x^{2} y^{2}=p q+2 \)
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