sin(30°+x)-sin(30°-x)用和（差）角公式化简 怎么算的

sin(30°+x)-sin(30°-x)等于多少? 已知sin(x+30°）=2sin(x-30°）,则tanx=( ) 函数y=3sin(x+30°)+5sin(x+90°)的最大值为 cos(27°+x)sin(57°+x)-sin(207°+x)sin(327°+x) sin(x-30)cos30=? 高一三角函数化简 sin^2(x-30)+sin^2(x+30)-sin^2(x) sin(x+30°)=0.6 Sinx= sin(30°+x)-sin(30°-x)用和（差）角公式化简 怎么算的 已知sin(x+30°）=2sin(x-30°）,则tanx=( ) 请求详解 已知sin(x+30°）=2sin(x-30°）,则tanx=( ) 请求详解 sin x 求f(x)=sin^2(x+30°)+sin(x+30°)*cos(x+30°)的单调递减区间 sin(33°-x)cos(27°+x)+cos(33°-x)sin(27°+x) 证明sin^2(x)+cos^2(x+30)+sin(x)cos(x+30)=3/4 sin(45-3x)*cos(60-3x)-cos(30+3x)*sin(45+3x) ? sin(45-3x)*cos(60-3x)-cos(30+3x)*sin(45+3x) sin(sin(x))的奇偶性 sin[(x 30)-30]怎么算?