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A salt and water (H₂O). H⁺ from the acid and OH^- from the base combine to make water. The salt formed depends on the acid and base counterions, and is usually dissolved in...

It's actually really easy to do your essay structuring right. I always followed this formula and still do! I use PEE. This is simply Point, Evidence, Example. So, if the question is, 'how did Hitler ga...

The first part is relatively simple.  If we write tan(3x) as tan(2x+x) we can use addition formulae to give:

tan(2x+x)= (tan(2x)+tan(x))/(1-tan(2x)tan(x))

tan(2x) = 2tan(x)/...

This is a basic example of a very important result: the chain rule. The difficulty of this sort of example is that we have a "function of a function". That is, we have the function '4-x' and ...

For this question the chain rule should be used, the chain rule is that dy/du*du/dx=dy/dx.

If we say u=(x²+2x) and therefore y=e^u

Then du/dx=2x+2 and d...