latex——公式等号对齐

\begin{align} s_{MQAM}(t) & =[\sum_{n}X_{n}g(t-nT_{s})]\cos\omega_{c}t-[\sum_{n}Y_{n}g(t-nT_{s})]\sin\omega_{c}t \\ & =X(t)\cos\omega_{c}t-Y(t)\sin\omega_{c}t \end{align} 用&放在须要对其的位置code 效果图：bl

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