我们现在来说明积分的换元公式也一样好记。
We shall now show that the change of variable formula for integrals is just as unforgettable.
利用定积分换元公式，可推导出一些非常实用的积分公式。
Several applied integral formula can be deducted from the method.
用特定系数法、换元法、配方法探求二元二次函数的极值公式。
The extremal formula of binary quadratic functions is studied by using method of undetermined coefficients, substitution method and method of completing the square.
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