化简[sin﹙2π+α﹚]/[cos﹙﹣π-α﹚cot﹙π/2-α﹚]=__
任意角三角函数 化简 tanα(cosα-sinα)+﹙sinα+tanα﹚/(cotα+cosα)
化简cos(α-π)cot(5π-α)/tan(2π-α)sin(-2π-α)
1.化简f(a)={[sin(π-α)cos(2π-α)cot(3π+α)]/[cot(-π-α)sin(-π-α)]}
化简sin^2(α+π)cos(π+α)cot(-α+2π)/tan(π-α)cos^3(-α-π)
sin^2α*tanα+cos^2α*cotα-2sinα*cosα(π-α)
化简sin^2α*tanα+cos^2α*cotα+2sinα*cosα-cotα
化简:sin^2α×tanα+cos^2α×cotα+2sinα×cosα
1)求证cotαcosα/cotα-cosα=tan(α/2+π/4)
化简 [Sin(π+α)\tan(π+α)] ×[ cot(2π-α)\cos(π+α)]×[sec(2π-α)\csc
化简[sin(π-α)tan(5π/2+α)]/[cos(2π-α)cot(π/2-α)]
求证 sin^2α×tanα+cos^2α×cotα+2sinα×cosα=tanα+cotα
求证:sin²α·tanα+cos²α·cotα+2sinα·cosα=tanα+cotα