This document solves several trigonometric equations to find the values of x and y. It first solves the equation Tg(x+y)= Cotg40° to find that x=40° and y=10°. It then solves Sen(x-y).Cosec30°=1 to find x-y=30° and Sen(2x-y)°.Cosec70°=1 to find x=40° and y=10° again.