Tangent drawn from point (c,d) to the hyperbola x225−y216=1 make ang – InterviewSolution

1.	Tangent drawn from point (c,d) to the hyperbola x225−y216=1 make angles α and β with the x− axis. If tanαtanβ=1, then the value of c2−d2
Answer» Tangent drawn from point $(c, d)$ to the hyperbola $\frac{x^{2}}{25} - \frac{y^{2}}{16} = 1$ make angles $α$ and $β$ with the $x -$ axis. If $tan α tan β = 1$ , then the value of $c^{2} - d^{2}$

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