sin² (π+α)-cos(π-α)sin(3/2π + α)+1sin² (π+α)-cos(π-α)si_数学解答

sin² (π+α)-cos(π-α)sin(3/2π + α)+1
sin² (π+α)-cos(π-α)sin(3/2π + α)+1的值是
A.1 B.-1 C.0 D.2

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解答

sin² (π+α)-cos(π-α)sin(3/2π + α)+1
＝sin² (α)－cos(α)cos(π ＋ α)+1
＝sin² (α)－cos²(α)+1
结果和α相关