Classification,+Comparison+and+contrast+-+Version+1+with+classmate+comments


 * Classification**

If we imagine a right triangle in the Cartesian plane (with the hypotenuse across the origin) and if we consider the acute angle that it forms with the axis X, as is showed in the next pictures: then we can classify the sine, cosine and tangent according to the quadrant in which they are, this is, they can be positive or negative, this information is the next chart:


 * Comparisons & Contrast**

 In the applications, there are not big diferences between sin,  cos and tan, the importance of each one of them depends on what   is wanted to be calculated, but generally there is a big similarity,     they are very importants mathematical tools that scientifics, engineers and architects can use to obtain some vital data to do a project, but not only are usefull to people with mathematical experience but for anyone that know some basic trigonometry , for example:



Those persons (in the picture) can find the distance between them and the basis of the building or between them and the climb of that building, just knowing the indicated angle and some extra data, (adjacent or opposite leg, hypotenuse) depending of what the want to find.

Basic trignometric functions are of vital importance in a lot of fields, like astronomy,  geography (the use of global positioning systems) physics, etc. Therefore,  one can only speak of the great similarity between them: they are very indispensable in the constant progress of the modern world. 