若sin(α-3π)=2cos(α-4π),则sin(α-π)+5cos(5π-α)/2sin(3/2π-α)-sin(-α)的值为
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若sin(α-3π)=2cos(α-4π),则sin(α-π)+5cos(5π-α)/2sin(3/2π-α)-sin(-α)的值为
若sin(α-3π)=2cos(α-4π),则sin(α-π)+5cos(5π-α)/2sin(3/2π-α)-sin(-α)的值为
若sin(α-3π)=2cos(α-4π),则sin(α-π)+5cos(5π-α)/2sin(3/2π-α)-sin(-α)的值为
sin(α-3π)=2cos(α-4π)化为
-sinα=2cosα
sin(α-π)+5cos(5π-α)/2sin(3/2π-α)-sin(-α)化为
-sinα-5cosα/-2cosα+sin(α)=2cosα+5/2-2cosα=5/2
已知0<α<π/2,且3sinα=4cosα求(sin^2α+2sinαcosα)/(3cos^2α-1)求cos^2α+sinαcosα
已知sinα+cosα=4/5且3π/22,若sinα+sinβ+sinγ=0,cosα+cosβ+cosγ=0,则cos(α-β)的值
已知sin(3π+α)=2cos(α-4π)求cos(π/2 -α)+5sin(π/2 +α)/2cos(π+α)-sin(-α)
若(4sinα-2cosα)/(5cosα+3sinα)=10,且α∈(-π/2,0)则cosα值为
若sin(α-π)=2cos(2π-α),求(sinα+5cosα)/(sinα-3cosα)的值,
已知tan(π-α)=2,求sin²α-2sinαcosα-cos²α/4cos²α-3sin²α+1
已知tan(π-α)=2,求sinα-2sinαcosα-cosα/4cosα-3sinα的值
若(sinα+cosα)/(sinα-cosα)=2 则sin(α-5π)·sin(3π/2-α)=?
若sinα+cosα/sinα-cosα=2,则sin(α-5π)*sin(3π/2-α)等于?
若(sinα+cosα)/(sinα-cosα)=2,求sin(α-5π)sin(3π/2-α)的值
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
关于三角函数诱导公式的证明题求证:[Sin(α-3π)+cos(α-4π)]/{[Cos(α-π)/sin(α-π)]-tan(α-π)}=[sin(4π-α)cos(2π-α)]/[cos(π-α)+sin(π+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?
已知tan(α+π/4)=2,求2cosα-sinα/cosα+3sinα
若cosα/sin(α-π/4)=-根号2/2,则cosα+sinα的值为、
已知sin(3π-α)=-2sin(π/2+α)则sinαcosα
设角a=-35π/6,则2sin(π+α)cos(π-α)-cos(π+α)/ 1+sin^2α+sin(π-α)-cos^2(π+α)sina=sin(-35π/6)=sin(-6π+π/6)=1/2 cosα=根号3/22sin(π+α)cos(π-α)-cos(π+α)/ [1+sin^2α+sin(π-α)-cos^2(π+α)]=2(-sinα)(-cosα)+cosα/[1+sin²
若sinα=1/2,则sin(π/4-α)cos(π/4-α)=