sin(x+30)*cos(x+45)求值:sin(x+30度)*cos(x+45度)*csc(45度-x)*tg(60度+x)*tg(30度-x)*sec(60度-x)x没给!

sin(45-3x)*cos(60-3x)-cos(30+3x)*sin(45+3x) ? sin(45-3x)*cos(60-3x)-cos(30+3x)*sin(45+3x) 已知tan=2,求(cos x+sin x)/(cos x-sin x)+sin^2x sin(180+x)+cos(-x)/sin(180-x)+cos(360+x)=2 求tan(x+45） 已知sin(x)+3cos(x)=2,求sin(x)-cos(x)/sin(x)+cos(x)=? 已知:tan x=2 求:sin x+cos x/sin x-cos x=? 2sin^2x - 5sin x cos x=3 cos^2x,求X, f（x）=sin x +cos x +sin x * cos x ,求值域 求导数:(cos x)'=－sin x 求导数:(cos x)'=－sin x cos x sin x=3,求cos x+sin x 求值sin(x-45)+cos(45+x) tan(x)=2求sin(x)cos(x)=? f'(sin x)=1-cos x 求f''(x) tan x=2,求 sin x * cos x=? 求f(x)=|sin x|+|cos x|的周期 tan x＝1.5 求sin x 和.cos x sin(x+y)sin(x-y)=k,求cos^2x-cos^2y 1/cos(x) - tan(x) = 3 求sin(x)1/cos(x) - tan(x) = 3求sin(x)