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If y is a function of u, which itself is a function of x, then dy/dx=(dy/du) x (du/dx) Differentiate the outer function and multiply by the derivative of the inner function. To illustrate this rule, look at ...

For specific subjects, some readings are required. And for subjects like physics, mathematics, you have to extend what you've learned in A-level, which means you have a deep understanding of A-level subjects...

Both Sn1 and Sn2 reactions are nucleophilic substitution reactions. Sn1 reactions proceed via 2 steps. An example of this is the substitution of a halogen group such as bromine with an OH- group forming an a...

You would use the quadratic formula when trying to find the value of a variable such as x in a quadratic equation but it can not be successfully factorised with whole numbers. Treating the the equation in th...

They are a group of specialised cells that respond to different changes in the environment called stimuli. Different types of receptors have different stimuli they react to such as light, sound, chemicals an...