数学题sin^(α+π)cos(-α+π)/tan(α+π)tan(α+2π)cos^(-α-π)化简：1.sin^(α+π)cos(-α+π)/tan(α+π)tan(α+2π)cos^(-α-π)计算：1.sin35cos25+sin55cos65 2.cos28cos73+cos62cos17

化简数学函数化简[(cos²(π/2+α)-sin²(7π/2+α))/(sinα+cosα)]-sin(7π-α)化简这道数学题, 高一数学题（三角函数的诱导公式）若[cos(π+α)*sin^2(-α)]/[sin(π+α)*cos^2(-α)=1/2,则tanα=? 若cosα>sinα,(-π/2 高中数学题sinπ/12·cosπ/12 一道数学题 已知cos(π/4-α)=根号下3/3 求sin(π/α) ,sin(3π/4-α) 几道超难数学题1,已知α,β∈（0,π/2） cos(α-β)=√3/2 sin(α/2-β)=-1/2求cos(α+β)2,已知α为锐角且sin^2 α-sinαcosα-2cos2 α=0 ,求tanα与sin(α-π/3)3,已知α,β∈（0,π/2）且sinβcscα=cos(α+β)求证1,tanβ=sinαcos 利用和差角公式化简 (2)sin(π/3+α)+sin(π/3-α)(2)sin(π/3+α)+sin(π/3-α)(3)cos(π/4+α)-cos(π/4-α)(4)cos(60°+α)+cos(60°-α)(5)sin(α-β)cosβ+cos(α-β)sinβ(6)cos(α+β)cosβ+sin(α+β)sinβ α∈（0,π／2 ）,比较 sin(cosα) 与cos(sinα)大小 比较大小sin(cosα)与cos(sinα)（0＜α＜π/2) 化简:sin(2π-α)cos(π+α)cos(11π/2-α)/cos(π-α)sin(3π-α)sin(-π-α)sin(9π/2+α) cos^2(π/4+α)=(cos(π/4)cosα-sin(π/4)sinα)² cos^2(π/4+α)是怎么等于(cos(π/4)cosα-sin(π/4)sinα)²的? [sin(5π-α)cos(-π-α)]/[cos(α-π)cos(π/2+α)]化简 高一数学题(关于sin和cos的求证问题)求证:1+sinα＋cosα+2sinαcosα-----------------------=sinα+cosα1+sinα+cosα 化简sin(-π/2-α)sin(πα)cos(-α-π)/cos(π-α)sin(3π α) 求值【sin(2π-α)sin(π+α)cos(-π-α)】/【sin(3π-α)-cos(π-α)】 sin(α-π)=2cos（α-2π）求cos平方α-sin平方αcosα (1+sinα+cosα)*[sin(α/2)-cos(α/2)]/√(2+2cosα)化简 （3/2*π cosαcos[(2k+1)π]-sinαsin[(2k+1)π]为什么等于-cosα