cosπ/6+根号3sinπ/6=?

cosπ/6+根号3sinπ/6=? 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) 求证:(根号3)*sinα+cosα=2sin(α+π/6) 根号3sin(π/6-a)-cos(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 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) cos(π/6-x)=根号3/3则cos(5π/6+x)-sin(x-π/6)的平方 已知5根号3sinα+5cosα=6根号2sinβ+根号6cosβ=1,且α∈(0,π/3),β∈(π/6,π/2),求cos(α+β)的值 已知cos(π/6-α)+sinα=(4倍根号3)/5,则cos(α-π/3)= 若tanθ=根号3/3,则cos^2θ-sin(θ+π/6)cosθ的值 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cos(α-π/6)+sinα=(4倍根号3)/5,则sin(α+7π/6)= 已知sin(π/6-a)=根号3/3,则 cos(4π/3+a) 化简sin(x-π/3)-cos(x=π/6)+根号3cosx 化简根号2sin(π/3-x)+根号6cos(π/3-x) 根号3×cosπ／12－sinπ／12=?