Rip van winkle fell asleep for a very long time. when he fell asleep, his beard was 8 millimeters long, and each passing week it grew 2 additional millimeters.

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

In a survey of 1015 adults, a polling agency asked, "when you retire, do you think you will have enough money to live comfortably or not. of the 1015 surveyed, 534 stated that they were worried about having enough money to live comfortably in retirement. construct a 90% confidence interval for the proportion of adults who are worried about having enough money to live comfortably in retirement.

What is the point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)