pls help with questions 15-18 :)

Question 15 0/1 pt @ Details Find- do2 for the given function. y = 2 csc (x) d'y da 2 Question Help: Message instructor D Post to forum Question 16 0/1 pt @ Details Find the requested higher-order derivative for the given function. d'sy do3 of y = 5 cos (x) day da3 Question Help: B VIDEO Message instructor D Post to forum . Question 17 C0/1 pt @ Details Find the 93 th derivative of the function f (ac) = cos (ac ). The answer is function Question Help: B VIDEO Message instructor D Post to forum Question 18 0/1 pt @ Details A mass on a spring bounces up and down in simple harmonic motion, modeled by the function s (t) = 4 cost where's is measured in centimeters and t is measured in seconds. Find the rate at which the spring is oscillating at t = 6 s. Round your answer to four decimal places. cm/s