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When a verb ends with er: it is an infinitive Whereas: when a verb ends with é it is past tense
A way to make the difference while writing Is: replace the verb by a 3rd verb group and see if it makes...

A stimulus is detected by a sensory receptor, e.g. pain detected by a pain receptor when the arm touches a sharp pin etcThis causes a nerve impulse to be created which travels along a sensory neurone to t...

The four factors of production are Capital, Land, labour and Enterprise/EntrreprenurshipAn easy way to remember this is with the anagram CELL.

To differentiate we must use implicit differentiation. So: siny=x .Differentiating both sides we get (dy/dx)cosy=1, so (dy/dx)=1/cosy . Using the common identity (sin²(y)+cos²(y)=1) ...

To differentiate we must use implicit differentiation. So: siny=x .Differentiating both sides we get (dy/dx)cosy=1, so (dy/dx)=1/cosy . Using the common identity ...