2sinπ/2-2cosπ/3+tanπ-3tanπ/6
化简:[sin(π+α)*cos(π-α)*tan(π-α)]/[cos(π/2+α)*tan(3π/2-α)*tan(
cosπ/3+tanπ/4+3tan²π/6+sinπ/2+cosπ+sin3π/2等于?.
化简:[sin(﹣α)cos(π-α)]∕[tan(π+α)sin﹙3π/2+α)]
已知tanα/2=2,1.求tan(α+π/4)的值 2.(6sinα+cosα)/(3sinα-2cosα)的值
已知tanα/2=2求tan(α+π/4)的值(6sinα+cosα)/(3sinα-2cosα)的值
tan(a-4π)cos(π+a)sin^2(a+3π)/tan(3π+a)cos^2(2/5π+2)=0.5,求tan
1.已知cos(π/6-α)=1/3,求sin(2/3π-α) 2.求证tan^2α-sin^2α=tan^2α-sin
tan(π-α)=2,求(sinα-2cosα)/(3sinα+cosα)的值?
化简sin(3π+a)tan(a-π)cot(π+a)/tan(2π-a)cos(π-a)
化简sin(2π-a)tan(π+a)cot(-a-π)\cos(π-a)tan(3π-a)
计算sin(-α-5π)*cos(α-2分之π)-tan(α-2分之3π)*tan(2π-α)
化简求值,sin(2a-π)tan(π+a)cota/cos(π-a)tan(3π-a)