【三角恒等变换】cos(33°-x)sin(63°-x)-cos(x+57°)sin(27°+x)
【三角恒等变换】cos(33°-x)sin(63°-x)-cos(x+57°)sin(27°+x)
sin(x+105°)cos(x-15°)-cos(x+105°)sin求化简
高一数学三角恒等变形sin(x+π/3)+2sin(x-π/3)-根号3cos(2π/3-x) 用三角恒等变形怎么解?
简单的三角恒等变换 函数y=[sin2x+sin(2x+pai/3)]/[cos2x+cos(2x+pai/3)]的最小
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(sin(sin(sin(x)=cos(cos(cos(cos(x),X等于多少?
证明:存在实数X,使得SIN x+cos X=60°
化简cos²(-X)-【tan(360°+X)】/【sin(-X)】
sin(1/x)-cos(1/x)/x
(x*sin x*cos x)的导数