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Cadences are often described as musical punctuation. They come at the ends of musical phrases and passages. There is a perfect cadence, which sounds final, like a full stop; there is an imperfect cadence whi...

Metals have delocalised electrons which are free to move and carry charge throughout the sea of cations.

A depression is a weather system of low pressure which moves across the British Isles from west to east. It involves two air masses which meet at a front. The air masses are tropical maritime which brings wa...

Ionic bonds are electrostatic forces of attraction between oppositely charged ions.

We have two functions multiplied together: x and cos(x). Therefore we have to use the product rule. First differentiate x and leave cos(x) untouched, so we get 1(cos(x))=cos(x). Then differentiate cos(x) and...