化简sin(x-25°)sin(65°-x)+cos(x-25°)cos(65°-x)的结果为
化简sin(x-25°)sin(65°-x)+cos(x-25°)cos(65°-x)的结果为
sin(x+105°)cos(x-15°)-cos(x+105°)sin求化简
化简cos(180°+x)*sin(x+360°)/[sin(-x-180°)*cos(-180°-x)]
求值:sin(10°+x)cos(50°-x)+sin(50°-x)cos(10°+x)
【三角恒等变换】cos(33°-x)sin(63°-x)-cos(x+57°)sin(27°+x)
(x*sin x*cos x)的导数
化简sin(a-x)cosx+cos(a-x)sinx的结果为
化简cos²(-X)-【tan(360°+X)】/【sin(-X)】
sin(sin(sin(sin(x)=cos(cos(cos(cos(x),X等于多少?
化简sin(x)(cos(x)+cos(3x)+cos(5x)+cos(7x))
sin x/(sin x+cos x) 的不定积分
化简 cos^2(x)*sin^2(x)-sin^2(x)