数学、急cos(x+27°)cos(18°-x)-sin(18°-x)sin(x+27°)等于多少
sin(sin(sin(sin(x)=cos(cos(cos(cos(x),X等于多少?
【三角恒等变换】cos(33°-x)sin(63°-x)-cos(x+57°)sin(27°+x)
sin(-x) cos(-x)等于多少
sin(x+105°)cos(x-15°)-cos(x+105°)sin求化简
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)]
求值:sin(10°+x)cos(50°-x)+sin(50°-x)cos(10°+x)
sin^3x-cos^3x化简等于多少
sin^2(x)cos^2(x)积分等于多少
cos^2x-sin^2x等于多少?
sin x(sin x+cos x)=1求x等于多少
数学达人! 例如.cos(x+π/4)、sin(x-4/π) .等于多少?