已知sina*cosa=60/169,且pi/4
问题描述:
已知sina*cosa=60/169,且pi/4
答
sina*cosa=60/169==>(sina+cosa)^2=1+2sina*cosa=1+120/169=289/169.而pi/4
已知sina*cosa=60/169,且pi/4
sina*cosa=60/169==>(sina+cosa)^2=1+2sina*cosa=1+120/169=289/169.而pi/4