\(\infty\begin{cases}\sin\\ \cos\\ \tan\overgroup{\hat{\overline{\frac{\overset{\placeholder{}}{\underrightarrow{\underset{\text{\placeholder{}}}{\overset{|_{\placeholder{}}^{\placeholder{}_{\placeholder{}}^{\placeholder{}}}}{\xrightarrow{}}}}}}{\placeholder{}}}}}\end{cases}\) hay dien vao o vuong

hay giai phep tinh nay

\(\int_0^{\infty}\!\sum{\iint\iiint\oint\prod{\prod_{\placeholder{}}^{\sum_{\placeholder{}}^{\sum{\mathrm{d}x\dfrac{\mathrm{d}}{\mathrm{d}x}\int}}}}}\,\mathrm{d}x\) \(=\)

sa✰ vay \(be\) \(de\left\Vert\int\right\Vert\) a

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