Question

If sinA=m and tanA=n, prove that m^-2 - n^-2=+-1

Answer 1

Answer:

$3 {26 { \times \times \times {3 < < 2 \times - 30xxx \times \frac{?}{?} \times \frac{?}{?} \times \frac{?}{?} \times \frac{?}{?} }^{?} }^{?} }^{?}$