cot(A+B+C) is, itself, a trigonometric function, so the question does not really make any sense!
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There are infinitely many possiblilities. y = f(x) where f(x) is any function of x other than of the form ax + b, where a and b are constants. f(x) could be a power function, a polynomial, a trigonometric function or any combination of functions.
a function
It is the equation of a straight line
You pass arguments to functions because that is how you tell the function what you want it to do. If you had, for instance, a function that calculated the square root of something, you would pass that something as an argument, such as a = sqrt (b). In this case sqrt is the function name, b is passed as its argument, and the return value is assigned to a.
4b