cos(x+27°)cos(18°-x)-sin(18°-x)sin(x+27°)=cos(x+27°)cos(18°-
【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
sin(sin(sin(sin(x)=cos(cos(cos(cos(x),X等于多少?
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)
证明:存在实数X,使得SIN x+cos X=60°
设f(x)=[2cos^3 x-sin^2 (360°-x)+2sin(90°+x)+1]/2+2cos^2 (180°
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已知tan=2,求(cos x+sin x)/(cos x-sin x)+sin^2x
化简cos²(-X)-【tan(360°+X)】/【sin(-X)】
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