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If you have already dabbled in the use of the perfect tense, you might be wondering, “When do I know which of the two auxiliaries to use?” The answer all depends on the verb you use.Most verbs in the perf...

For a native speaker of English trying to speak in the past in French, it can be tricky to know which form of the past to use in French without prior knowledge. This is because there is no single, one-siz...

If y is a function of u, which itself is a function of x, then 

dy/dx=(dy/du) x (du/dx)

Differentiate the outer function and multiply by the derivative of the inner function.  

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For specific subjects, some readings are required. And for subjects like physics, mathematics, you have to extend what you've learned in A-level, which means you have a deep understanding of A-level s...