Discussion

If $\frac{{\sin }^2 \theta }{{\tan }^2 \theta -{\sin }^2 \theta }$= 5, then the value of $\frac{24 {\cos }^2 \theta -15 se{c}^2 \theta }{6 \cos e{c}^2 \theta -7co{t}^2 \theta }$is: