化简 sin^2(派/3+α)+sin^(派/6-α)
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化简 sin^2(派/3+α)+sin^(派/6-α)
化简:sin(x-2派)cos(x+派)tan(x-99派)/cos(派-x)sin(3派-x)sin(-x-派)
化简:{sin(2派-α)cos(3派+α)cos3派/2+α}/{sin(-派+α)sin(3派-α)cos(-α-派)}
已知sin (α+派/3)+sinα=-4根号3/5,-派/2
已知sinα=4分之5,求下列三角函数值 sin(-α) sin(派-α) sin(派+α) sin(2派-α)
化简:√[1-2sin(3-派)cos(3-派)]
化简:√[1-2sin(3-派)cos(3-派)]
化简cos(派+a)·sin(a+2派)/sin(-a-派)·cos(-派-a)
化简sin(派-x )
化简sin(-A-2派)
已知sina-2cosa=o,求tan(-a-派)sin(-派-a)/sin(派-a)cos(2派-a)sin(-a+2/3派)求值
化简 sin平方(派-α)+tan(-α)分之sin(-α)cos(2派-α)
对任意实数x,化简sinx+sin(x+2/3派)+sin(x+4/3派)=?
化简sin(-派+阿拉法)sin(3派-阿拉法)cos(-阿拉法-派)/sin(2派-阿拉法)cos(3派+阿拉法)
化简2sin(派/2-x)×sin(派/4+x),
(化简):[sin(派-啊而法)*sin( (3派/2)-啊尔法)*tan(-啊尔法-派)] / cot(啊尔法-2派)*cot( (3派/2)+啊尔法)*cos( (派/2)+啊尔法)
已知sin∝+2cos∝=0.(1)化简sin(3派/2+α)-2cos(5派/2-α)/cos(2011派-α)(2)求sin(2011派/2-2α)的值
化简4sin派/8*cos派/8*(cos^2派/8-sin^2派/8)