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](/uploads/image/z/3997965-21-5.jpg?t=sin%26%23178%3B%28%CF%80%2B%CE%B1%29-sin%28%CE%B1%2B3%CF%80%2F2%29cos%28-%CE%B1%29%2B1%E7%9A%84%E5%80%BC%E4%B8%BA)
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