What is the value of (tanA - sinA)/(tanA +sinA)?

$ \frac{tanA - sinA}{tanA +sinA}$

Taken A = 45°

= $ \frac{1 - \frac{1}{\sqrt{2}}}{1 +\frac{1}{\sqrt{2}}}$

= 1 - $(\frac{1}{\sqrt{2}})^2$      (using (a+b)(a-b) =a²-b²)

= 1 - $\frac{1}{2}$

= $\frac{1}{2}$

This is satisfied by option#3 $\frac{secA - 1}{secA+ 1}$