化简cos(2α-360°)1.cos(2α-360°)2.csc(α-450°)
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化简cos(2α-360°)1.cos(2α-360°)2.csc(α-450°)
cos^2α+cos^2(α+π/3)-cosαcos(α+π/3)化简
【2cos³α-cos²α+cosα-2】/2cos²α+cosα+2化简
化简:(1)(cos²10°-cos²80°)²+cos²70°=? (2)(sinα-cosα)²+sin4α/2cos2α=
化简cos^2(-α)-[tan(360°+α)/sin(-α)]
求和:cos(0)+cos(α)+cos(2α)+cos(3α)+……cos(nα)
证明cos(360°-α)=cosα OK?
化简√cos²α-2cosα+1
cos²α+cos²(120°-α)+cosαcos(120°-α)化简cos²α+cos²(120°-α)+cosαcos(120°-α)
化简:1+sin(α—360°)cos(α—270°)—2(cosα)^2
2sinα*cosα*cos(2π-α)+cos(π+2α)*cosα*tanα化简!
化简sin(α+β)-2cosαsinβ/2cosαcosβ-cos(α+β)
化简:sin^2αcos^2β-cos^2αsin^2β+cos^2α-cos^2β具体步骤,
化简cos²1°+cos²2°+cos²3°+…+cos²89°
化简cosα+cos(120°-α)+cos(120+α)
[sin(5π-α)cos(-π-α)]/[cos(α-π)cos(π/2+α)]化简
化简:cosα+cos(2π/3-α)+cos(2π/3+α)
化简1+cos(a-360)cos(a-180)-2cos^2a