\frac{\cos^{3}{a} \sin^{3}{a}}{1 + \sin{a} \cos{a}}

请输入您的数学问题…… \frac{\cos^{3}{a} - \sin^{3}{a}}{1 + \sin{a} \cos{a}}

问题

\frac{cos ^{3} a - sin ^{3} a}{1 + sin a cos a}

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