If = p^2 - 1p^2 + 1, then cosθ is equal to:

Answer: Option A

$$\begin{array}{rl}& \sin \theta =\frac{p^2-1}{p^2+1}\\ & \text{Let }p=2\end{array}$$

$$\begin{array}{rl}& \text{Now from option A}\\ & \frac{2\times 2}{1+4}=\frac{4}{5}\end{array}$$