化简 {sin[α+(k+1)π]+sin[α-(k+1)π]}/[sin(α+kπ)*cos(α-kπ)],k∈Z
化简[sin(kπ-α)*cos(kπ+α)]/{sin[(k+1)π+α]*cos[(k+1)π-α]}
sin(kπ-α)*cos〔(k-1)π-α〕/sin〔(k+1)π+α〕*cos(kπ+α) ,k属于Z
化简 sin(4k-1/4π- α)+cos(4k+1/4π -α)(k∈Z)
化简sin(4k-1/4π- α)+cos(4k+1/4π -α)(k∈Z)
设k∈Z,化简sin(kπ−α)cos[(k−1)π−α]sin[(k+1)π+α]cos(kπ+α)的结果是( )
sin(kπ-α)cos【(k-1)π-α】/sin【(k+1)π+α】cos(kπ+α) (k∈Z) 希望老师能详细解
已知sin^4α+cos^4α=1,求:sin^kα+cos^kα(k∈Z).
【1】求证sin(kπ-a)cos(kπ+a)/sin[(k+1)π+a]cos[(k+1)π+a]=-1,k∈Z
已知α、β≠kπ+π2(k∈Z),且sinθ+cosθ=2sinα , sinθcosθ=sin
当2kπ-π/4≤α≤2kπ+π/4(k∈Z),化简√(1-2sinα×cosα)+√(1+2sinα×cosα)
已知sinα=4sin(α+β),α+β≠kπ+π/2(k∈Z).求证tan(α+β)=sinβ/(cosβ-4)
已知sin(π-α)-cos(-α)=1/5,求tan[(2k+1)π+α]+cot[(2k+1)π-α](k属於Z)的