化简:cos(-π-α)
化简:cos(-π-α)
化简cos平方α+cos平方(α-π/3)+cos平方(α+π/3) 急、~
化简{sin(π+α)^3cos(-α)cos(π+α)}/{tan(π+α)^3cos(-π-α)^2}
(1+sinα+cosα)*[sin(α/2)-cos(α/2)]/√(2+2cosα)化简 (3/2*π
1.化简sin²α+cosαcos(π/3+α)-sin²(π/6-α)
化简cos方(π/4-α)+cos方(π/4+α)
化简cos(π/4-α)²+cos(π/4+α)²
化简cos(π/12-α)-根号3cos(5π/12+α)
化简:sinα-√3 cosα+2cos(α-π/3)
三角函数化简cos(α)+cos(π/3+α)= 化简.
化简:cos2α-cos2β/cosα-cosβ
化简sin(α-5π)/cos(3π-α)×cos(π/2-α)/sin(α-3π)×cos(8π-α)/sin(-α-