The three expressions, sin-1, cos-1, and tan-1 are called trig functions and are used to find the measure of the acute angles of a right triangle if you know the lengths of at least two sides.

Ricky takes out a $31,800 student loan to pay his expenses while he is in college. after graduation, he will begin making payments of $190.66 per month for the next 30 years to pay off the loan. how much more will ricky end up paying for the loan than the original value of $31,800? ricky will end up paying $ more than he borrowed to pay off the loan.