化简sin(α-2π)cos(3π/2-α)+tan(π-α)tan(π/2+α)+cos^2(π-α)_数学解答

化简sin(α-2π)cos(3π/2-α)+tan(π-α)tan(π/2+α)+cos^2(π-α)

人气：230 ℃　时间：2020-05-26 05:29:40

解答

sin(α-2π)cos(3π/2-α)+tan(π-α)tan(π/2+α)+cos^2(π-α)
=-sinasina+tanacota+cos^2a
=cos^2a-sin^2a+1
=2cos^2(a)