tanx = 1/7,tany = 1/3tan2x = 2tanx/(1-(tanx)^2)= (2/7) / (48/49)= 7/24tan( 2x+y)= (tan2x + tany)/(1-tan2xtany)= (7/24 + 1/3) /(1- (7/24)/3)= (15/24)/ (65/72)= (5/8)(72/65)= 9/132x+y = arctan(9/13)