The angle of elevation of a tower of height h from a point A due...

Options

1. A$\mathrm{h}^2\left(\cot ^2 y-\cot ^2 x\right)=z^2$
2. B$z^2\left(\cot ^2 y-\cot ^2 x\right)=h^2$
3. C$\mathrm{h}^2\left(\tan ^2 \mathrm{y}-\tan ^2 \mathrm{x}\right)=\mathrm{z}^2$
4. D$z^2\left(\tan ^2 y-\tan ^2 x\right)=h^2$