right angled triangle have only three angles and three sides therefore we have three formulae for finding the ratio of three sides but when we have to find the inverse of all we Get three more formulae therefore 3+3=6
(personal opinion_)
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The six basic functions of trigonometry are the sine, cosine, tangent, cosecant, secant, and cotangent functions. Abbreviated sin, cos, tan, csc, sec, cot.
Not specifically trigonometry, but functions in general. As a general rule, functions must be evaluated before using the results in other parts of the calcuation.
Trigonometry functions are used to work out the various properties of triangles.
The same as in any other math class. All functions are relations but all relations are not functions. A function must have only one 'answer' in the range for each value of the domain. Relations are just pairing of numbers with no such restriction on the range.
Trigonometry is a whole branch of mathematics and does not comprise only one formula!