根号3sin(π/6-a)-cos(π/6-a)
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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)
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)
化简根号3sin(π/6-a)-cos(π/6-a)
cosπ/6+根号3sinπ/6=?
已知sin(阿尔法+π/3)=a,那么根号3sin阿尔法-cos阿尔法的值
已知sin(3π -a)=根号2sin(2π +b),根号3cos(-a)=-根号2cos(π +b)且0
已知sin(3π -a)=根号2sin(2π +b),根号3cos(-a)=-根号2cos(π +b)且0
已知sin(3π-a)=根号二cos(3π/2+β),根号三cos(-a)=-根号二cos(π+β),且0
[Sin(6π+a)Cos(7π-a)]/[Sin(3π+a)+Sin(-π+a)
求证:(根号3)*sinα+cosα=2sin(α+π/6)
sin(a+π/3)+2sin(a-π/3)-根号3cos(2π/3-a)
cos(a+π/6)-sina=(3根号3)/5,则sin(π/6-a)=?
已知sin(π-a)-cos(π+a)=(根号2)/3(π/2