a simple measuring device is used at point X and Y on the same horizontal level to measure the angle of elevation of a certain mountain.if X is known to be 5200m above,/XY/=4000m and the measurement of the angle elevation of P at X and Y are 15° and 35° respectively,find the height of the mountain.(take Tan 15°=0.3,Tan 35°=0.7.​