What is the sine of an angle with opposite side length 5 and hypotenuse length 13?
+
What is the limit as x approaches infinity of the function f(x) = e^x / x^2 + 1?
+
What is the value of the mixed number 3 1/2 when added to the product of factoring the number 42 and a real number that is 5 less than double the number 7?