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What is the use of the plus-que-parfait tense in French?

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 granted in Engl...
LM
Answered by Lucy M. • French tutor
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Integral of ln x

xln(x) - x
OG
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d/dx ( sin x) ^3

3(sin x) ^2 cos x
OG
Answered by Oscar G. • Maths tutor
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differentiate y = 4x^3(12e^-4x) with respect to x

y = 4x 3 e -4x u = 4x 3 v = e -4x du/dx = 12x 2 dv/dx = -4e -4x using the product rule; vdu +udv vdu + udv = 12x 2 e -4x - 16x 3 e -4x
LM
Answered by Lewis M. • Maths tutor
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What is the 'Nth-term rule' in linear (arithmetic) sequences and how is it used?

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’. It i...
EI
Answered by Edmund I. • Maths tutor
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