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The plus-que-parfait tense is a past tense used to describe an event which happened before another event. It is a very common tense in French, but one which is often more implied or taken for gra...

xln(x) - x

3(sin x) ^2 cos x

y = 4x³e^-4x   u = 4x³  v = e^-4x du/dx = 12x² dv/dx = -4e^-4x using the product rule; vdu +udv  vdu + udv = 12x²e^-4x -...

In any sequence, the position of a term (1st, 2nd, 3rd etc.) is represented by the letter ‘n’. In linear sequences only, the ‘nth-term rule’ gives the value of any term in that sequence at position ‘n’. I...