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First, recall that tan(x) can be rewritten in terms of sine and cosine.

tan(x) = sin(x)/cos(x)

The rephrasing of our question suggests that we should try the substitution ru...

In most instances where English uses the definite article, French does too. However, it has some special uses in French, which I shall explain below.

1) Must be used with all abstract nou...

Blood glucose is controlled by a negative feedback mechanism. 

When blood glucose levels rise, this is detected by beta cells in the Islets of Langerhans in the pancreas. In response, the...

Genes, chromosomes and DNA are three vital components of cells and many students often confuse them with each other.

DNA stands for Deoxyribose Nucleic Acid. DNA molecule...

The biological and behavioural views of psychology allow for two different approaches to studying the subject and often link to the nature-nurture debate.

The biological psychological app...