Danish

A person is riding on a flatcar traveling at a constant speed of 200 km/s (Fig.). He wishes to throw a ball through a stationary hoop 90 km above the height of his hands in such a manner that the ball will move horizontally as it passes through the hoop....

7x + 5(602) = 12(700) 7x + 3010 = 8400 7x = 8400 - 3010 7x = 5390 x = 5390/7 x = 770

Prove Kijiye ki tanA/secA-1+tanA/secA+1=2cosecA