化简根号3sin(π/6-a)-cos(π/6-a)

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化简根号3sin(π/6-a)-cos(π/6-a)
化简根号3sin(π/6-a)-cos(π/6-a)

化简根号3sin(π/6-a)-cos(π/6-a)
根号3sin(π/6-a)-cos(π/6-a)
=2[sin(π/6-a)*cosπ/6-sinπ/6*cos(π/6-a)]
=2sin(π/6-a-π/6)
=2sin(-a)
=-2sina

化简根号3sin(π/6-a)-cos(π/6-a) 根号3sin(π/6-a)-cos(π/6-a) 由cos(a+b)=cos a cos b-sin a sin b cos(a-b)=cos a cos b+sin a sin b解题设a为锐角,证:1、2分之根3乘cos a + 2分之1乘sin a=cos(6分之π-a)2、cos a-sin a=根号2cos(4分之π+a) 求证 cos(A)+ 根号3sin(A)=2sin(π/6+A) 化简根号2sin(π/3-x)+根号6cos(π/3-x) (1/2)cosα-(根号3/2)sinα可以化简为( )A.sin(π/6-α) B.sin(π/3-α) C.sin(π/6+α) D.sin(π/3+α) 1.化简根号2cos x - 根号6sin x2.已知sin(α-β)cosα-cos(β-α)sinα=3/5,β是第三象限角,求sin(β+5π/4)的值.3.化简sin(α-β)sin(β-λ)-cos(α-β)cos(λ-β) 已知sin(π-a)-cos(π+a)=(根号2)/3,(π/2<a<π) 化简我化简是:sin a - cos a =(根号2)/3答案化简是sin a + cos a=(根号2)/3注意取值范围,说清楚点多给分,我为什么错了a是第二象限,那么π+a应该是 设角a=-35π/6,则2sin(π+α)cos(π-α)-cos(π+α)/ 1+sin^2α+sin(π-α)-cos^2(π+α)sina=sin(-35π/6)=sin(-6π+π/6)=1/2 cosα=根号3/22sin(π+α)cos(π-α)-cos(π+α)/ [1+sin^2α+sin(π-α)-cos^2(π+α)]=2(-sinα)(-cosα)+cosα/[1+sin² cos(π/6+a)=根号3/3 求sin(5π/6-a)=? cos(π/6-a)=根号3/3 则sin(5π/6-2a)值 已知sin(π/6-a)=根号3/3,则 cos(4π/3+a) sin a +cos a = (根号下2)sin(a+pi/4)如何化简? cosπ/6+根号3sinπ/6=? 化简二次根号下1+2sin(π-3)cos(π+3)化简:二次根号下1+2sin(π-3)cos(π+3) f(x)=2sin(x+a/2)cos(x+a/2)+2根号3 cos²(x+a/2)-根号3 如何化简? 化简求值sin(-20/3π)cos(43/6π)+sin(35/6π)cos-(17/3π)sin(-20/3π)cos(43/6π)+sin(35/6π)cos-(17/3π)[2sin50°+cos10°(1+根号(3)tan10°)]/根号(1+cos10°) 已知sin(阿尔法+π/3)=a,那么根号3sin阿尔法-cos阿尔法的值