sin^2(67.5)

sin^2(67.5) 【证明】Sin A+sin B=2Sin 22 sin(x^2)/sin^2x 求导 为什么sin-sin^2=1/4 sin(arccos(2sin(a)))= 2sin^2 2sin@+cos@等于? 化简sin(-2x) 若sin^2a lim(x(sin)^2) sin(arccos1/2) sin^2(x)求导 sinπ/2是什么意思 sin^2(-a)化简 ∫sin^2xdx sin(2x)积分 化简sin^2α+sin^2β+2sinαsinβcos(α+β) 已知sin(a)=2sin(b)求sin(a/2)/sin(b/2)的值.