sin^2(x+π/12)-sin^2(x-π/12)=1/4,且x在（π/4,π/2）,则tanx=?

sin^2(π/3-x)+sin^2(π/6+x) 2sin(x+π/4)sin(x-π/4)=? sin(x^2)/sin^2x 求导 sin^2(π/4 +x) sin(πx/2)求导 化简 sin²x+sin²(x+2π/3)+sin²(x-2π/3) 计算,sin(π/12)-sin(5π/12)+2sin(π/8)sin(3π/8) 化简sin(-2x) lim(x(sin)^2) sin^2(x)求导 sin(2x)积分 化简Sin(2x+π/6)+Sin(2x—π/12) y=12sin(2x+π/6)+5sin(π/3-2x)最大值 y=12sin(2x+π/6)+5sin(π/3-2x)的最大值 求证:(sin 2x /(1-cos 2x) )·(sin x /(1+sin x))=tan (π/4-x/2). 化简sin（2π+x）cos（π-x）sin（π-x）/cos（x-π）sin（-π-x）sin（π+x） f(x)=（1+cotx)sin^2x-2sin(x+π/4)sin(x-π/4)还有一题, 已知函数f(x)=(1+1 anx)sin^2x+m sin(x+π/4)sin(x-π/4)