sin²(π+α)-sin(α+3π/2)cos(-α)+1的值为

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sin²(π+α)-sin(α+3π/2)cos(-α)+1的值为
sin²(π+α)-sin(α+3π/2)cos(-α)+1的值为

sin²(π+α)-sin(α+3π/2)cos(-α)+1的值为
sin²(π+α)-sin(α+3π/2)cos(-α)+1
=(-sina)²-(-cosa)*cosa+1
=sin²a+cos²a+1
=1+1
=2