化简cos(90°-α)/sin(270°-α)*sin(360°-α)*sin(180°-α)
化简cos(90°-α)/sin(270°-α)*sin(360°-α)*sin(180°-α)
①sin(α+180°)cos(-α)sin(-α-180°)和②sin³(-α)cos(2π+α)tan(-
为什么根号3sinα+cosα=2sin(α+30°)
化简:(1)sin(α+β)−2sinαcosβ2sinαsinβ+cos(α+β)
化简(sinα/2+cosα/2)²+2sin²(90°-α/2) 帮帮忙吧
Cos(180°+α)*sin(α+360°)/sin(-α-180°)*cos(-180°-α)
(sinα+cosα)^2化简
化简:cos²(α+15°)+sin²(α-75°)+sin(α+180)*cos(α-180)
化简cos(540°-α)sin(α-360°)/sin(-α+180°)cos(180°+α)
sinα+cosβ=sin225° sinα-cosβ=cos225°求cos(α-β)及cos(α+β)
sinα+sinβ=sinγ cosα+cosβ=cosγ 证明cos(α-γ)
化简sin(α+180°)cos(-α)sin(-α-180°)