已知cos(π/6-α)=根号3/3,求cos(5π/6+α)-sin²(-α+7π/6)的值.求详解,
已知cos(π/6-α)=根号3/3,求cos(5π/6+α)-sin²(-α+7π/6)的值.求详解,
已知cos(α-π/6)+sinα=4根号3/5,求sin(α+7π/6)的值
已知cos(π/6-π)=根号3/3,求cos(5π/6+π)-sin²(α+π/3) 要具体步骤哈- -
已知sin(π-α)-cos(π+α)=根号2/3 求下列各式的值
已知cos(π/6-α)=根号3/3,求cos(5π/6+α)的值
已知6sin^2α+sinαcosα-cos^2α=0,求sin(2α+π/3)的值
已知6sin²α+5sinαcosα-4cos²α=0,α∈(3π/2,2π),求tanα的值
已知cos(π/6-a)=根号3/3,求cos(5π/6+a)-sin²(a-π/6)的值.
已知tanα=3,求4sin²α+3sinα×cos+6cos²α的值.
3:已知α β均为锐角,且sinα=根号5/5,cosβ=根号10/10,求α-β的值.求详解,
已知sin(π-α)-cos(π+α)=根号2分之4,求sin(π+α)+cos(3π-α)的值
已知(sinα-cosα)/(sinα+cosα)=1/3,则cos^4(π/3+α)-cos^4(π/6-α)的值为