cos(π/2)-tan0+1/3tan平方π-sin(3π/2)+cosπ

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cos(π/2)-tan0+1/3tan平方π-sin(3π/2)+cosπ
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cos(π/2)-tan0+1/3tan平方π-sin(3π/2)+cosπ
cos(π/2)-tan0+1/3tan平方π-sin(3π/2)+cosπ

cos(π/2)-tan0+1/3tan平方π-sin(3π/2)+cosπ
这个没有过程啊,都是特殊值啊
cos(π/2)-tan0+1/3tan平方π-sin(3π/2)+cosπ
=0-0+(1/3)*0-(-1)+(-1)
=0

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