化简sin(π−α)cos(3π−α)tan(−π−α)tan(α−2π)tan(4π−α)sin(5π+α)
化简:[sin(π+α)*cos(π-α)*tan(π-α)]/[cos(π/2+α)*tan(3π/2-α)*tan(
已知tanα=3,求2cos(π−α)−3sin(π+α)4cos(−α)+sin(2π−α)
若α∈(0,π/6) 比较tan(sinα),tan(cosα),tan(tanα)的大小
设tan(5π+α)=m,则sin(α−3π)+cos(π−α)sin(−α)−cos(π+α)
已知tanα=2,求sinα−3cosαsinα+cosα
求证:[sin^2(π+α)*cos(π/2-α)+tan(2π-α)*cos(-α)]/-sin^2(-α)+tan(
计算sin(-α-5π)*cos(α-2分之π)-tan(α-2分之3π)*tan(2π-α)
证明:(1)tanα−tanβtanα+tanβ=sin(α−β)sin(α+β)
已知α为第二象限角,f(α)=sin(α−π2)cos(3π2+α)tan(π−α)tan(−α−π)sin(−α−π)
若tanα=2,求2sinα+cosαsinα−cosα
证明:1+sinα−cosα1+sinα+cosα=tanα2
化简sin³(﹣α)cos(2π+α)tan(2π-α)/sin(α-2π)cos(α-3π/2)-tan(π