cos3分之2π等于几

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cos3分之2π等于几cos3分之2π等于几cos3分之2π等于几cos(2π/3)=-cos(π-2π/3)=-cos(π/3)=-1/2cos3分之2π等于-1/2cos3分之2π=cos(π-π

cos3分之2π等于几
cos3分之2π等于几

cos3分之2π等于几
cos(2π/3)=-cos(π-2π/3)=-cos(π/3)=-1/2

cos3分之2π等于-1/2

cos3分之2π=cos(π-π/3)=-cosπ/3=-1/2

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