Question

A window of a house is h metre above the ground. From the window the angles of elevation and depression of the top of another house situated on the opposite side of the lane are found to be alpha and beta respectively. Prove that the height of the house is h(1 + tan alpha tan beta)

Answer 1

first we should know what we have to prove. take out the value of tanalpha and tanbeta and than find what is the common in both and then equate the equations,your answer will come