已知f(α)= sin(π-α)cos(2π-α)cos(-α+3/2π)/cos(π/2-α)sin(-π-α) (1)化简f(α) (2)若α...已知f(α)= sin(π-α)cos(2π-α)cos(-α+3/2π)/cos(π/2-α)sin(-π-α)(1)化简f(α)(2)若α为第二象限的角,且cos(α-3/2π)=1/5,求f(α)的值

已知f(α)= sin(π-α)cos(2π-α)cos(-α+3/2π)/cos(π/2-α)sin(-π-α) (1)化简f(α) (2)若α...已知f(α)= sin(π-α)cos(2π-α)cos(-α+3/2π)/cos(π/2-α)sin(-π-α)(1)化简f(α)(2)若α为第二象限的角,且cos(α-3/2π)=1/5,求f(α)的值 已知α∈(0,π/2),f(α)=1/sinα+8/cosα,则f(α)最小值为 已知f(cosα)=cos17α ,求证:f(sinα)=sin17α 已知f(1-cosα)=sin^2α,求f(tanα)的最值 已知f(1-cosα)=sin^2α,求f(tanα)的最值 高中数学三角函数化简题已知 fα=sin(π-α)cos(2π-α)cos(-α+3/2π)/cos(π/2-α)sin（-π-α）已知fα=sin(π-α)cos(2π-α)cos(-α+3/2π)/cos(π/2-α)sin（-π-α）化简若α第三象限,且cos(α-3/2π)=1/5,求fα若α=-31/3π,求f 已知f(阿尔法)=sin(π/2+α)+3sin(-π-α)/2cos(11π/2-α)-cos(5π-α).(1)化简f(α) (2)已知tanα=3,求f(α)的值 已知f(α)=(tan(π-α)*cos(2π-α)*sin(二分之π+α))/(cos(-α-π)) (1)化简f(α） 已知f(α)=sin(π-α)cos(2π-α)tan(-α+3π/2)/cos(-π-α)则f（-13π/3）的值是 已知f(α)=(sin(Π／2-α)cos(2Π-α)tan(-α+3Π))／(tan(Π+α)sin(Π／2＋α)),化简f(α) 已知sin(3π-α)=-2sin(π/2+α)则sinαcosα 已知f(α)=2tanα-(2sin^2α/2-1)/(sinα/2cosα/2),求f(π/12) 1．已知tan(π+α)=3,则sin(π+α)×cos(π-α）= 2．已知sinα=根号5/5,则sinα的四次方-cosα的四次方=3..函数f(x)=sinπX/4,则f(1)+f(2)+...+f(2012)=4.已知sinα=1/3,则sinα的4次方-sinα的2次方+cosα的平方= 如果f(sinα+cosα)=sinαcosα那么f(cos30′)=? cosα*cosβ=1,cos(α+β）等于sinαsinβ+cosαcosβ=0,则sinαcosα+sinβcosβ的值为已知tan（π/4+α）=2,求1/（2sinαcosα+（cosα）^2)的值求函数f(x)=2+2sinxcosx+sinx+cosx的最大值和最小值 已知cosα+sinα/cosα+sinα 函数f(x)=3/2Xtan2α+3cos²α-sinαcosα 求函数f（x）解析式 已知sinα+sinβ+sinγ=0,cosα+cosβ+cosγ=0.求cos(β sin(π/2+α)·cos(π/2-α)/cos(π+α)+sin（π-α）·cos（π/2+α）/sin（π+α）=?（2）sin²40°+sin²50°=?（3）已知sin10°=k,则cos620°=?（4）已知f（cosx）=cos3x,则f（cos30°）=?