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Here we have x(t) and y(t) which are both functions of t, but we want dy/dx, which doesn't involve t, we therefore need to use the chain rule. The chain rule tells us that: dy/dx = (dy/dt) x (dt/dx).y = s...

Pushkin subverts the European and Russian literary genres, by hybridising them both in his novel-in-verse Evgenii Onegin. Thus, but not fully complying to either of the traditions of his time, he...

What is immediately clear from this extract is Hamlet and his father have, or at least had in the latter’s living years, a close relationship. This is seen by how both characters’ speech contributes to th...

following BIDMAS we start with the second expression by squaring it, i.e. (x-4)(2x + 3y)(2x + 3y). It is important we do it in the right order, otherwise we could get a wrong answer. We use the FOIL (Firs...

The production of ATP occurs through the process of photophosphorylation. When light energy hits the chlorophyll molecule, it is absorbed by photosystem I and pho...