Hello!

I am taking Math 151 this quarter, and I could really use some help with this one. I am learning about differentiation patterns this week, and I'm having some difficulty computing this problem. Thank you in advance!

A strange object is moving in the air (defying gravity) so that its height after t seconds is given by h(t) = 22 si11(t)cos(t) + 11t meters. If you graph this function, you can see it's moving up and down, but going higher and higher as time goes on. a) At what time, 25, does the object m change direction from going up to going down? Please be exact with your answers. No decimals allowed. And of course show all calculus and algebra work. b) What is the acceleration of the object at that same time? . . meters acceleration at that time 2 sec2 Again, be exact with your answers. No decimals allowed and show all work