sin(30°+x)-sin(30°-x)
高一三角函数化简 sin^2(x-30)+sin^2(x+30)-sin^2(x)
sin(x+30)*cos(x+45)
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(x+105°)cos(x-15°)-cos(x+105°)sin求化简
化简cos(X-30°)+sin(X+30°)+cosX+1
化简sin(x+60°)+2sin(x-60°)-3
化简sin(x+120°)+sin(x+240°)
设x为锐角,若cos(x+30°)=4/5 ,sin(2x+15°)等于?
化简sin(x-25°)sin(65°-x)+cos(x-25°)cos(65°-x)的结果为
化简cos(180°+x)*sin(x+360°)/[sin(-x-180°)*cos(-180°-x)]