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 * What about Odalys? Did she correct this? **

Basic trigonometric functions (sine, cosine, and tangent)

Basic Trigonometric Functions sine, cosine and tangent (or better known as sin, cos and tan) are a set of ratios between two quantities, in trigonometry, those quantities are the lengths of the sides of a right triangle (sometimes another type of triangle), which are known as hypotenuse, adjacent leg and opposite leg. First of all, sine is the ratio between the opposite leg and the hypotenuse; second, cosine is the ratio between the adjacent leg and the hypotenuse and finally, tangent is result from the division between sine and cosine. Sin, cos and tan can be represented into a unit circle forming a right triangle, and so, they can be plotted as functions that depends of an angle, but not all the time this trigonometric functions have a graphic sense, __we’ll__ never see a sin, cos or tan drawn in a triangle because they are just quantities or ratios that are very useful in a lot of fields.


 * Wow... my only comment do not use contractions in formal papers **