This is a 2 part question, kind of.... Part 1: Find the derivative.f (t) = 3t sin2 t Part 2: Is there any easy way to remember the Trigonometric Derivatives or can someone suggest a site or "cheat sheet" that might help?

How would I find the exact values based on the trig functions?

please help with the answers:  a. given the functions f(x)=cosx and g(x)=sqrt 10+x determine the value of g(f(pi)) options : sqrt 11, 9, 3, sqrt pi b. true or false= the graph of y=sin[1/2x+pi/4] can be drawn by translating the graph of y=sinx left pi/2 radians c.the height, h, in metres, above the ground of a car as a ferris wheel rotates can be modelled by the function h(t)=16cos(pi(t)/120)+18, where t is the time, in seconds. what is the radius of the ferris wheel? options: 8m, 9m, 16m or 18m

Is there any serious difference between 5pi/3 and -pi/3? I had an online homework question that rejected 5pi/3 but would accept -pi/3. The question was to find angle y whose sine is -(sqrt(3)/2) and in the interval [-pi/2,pi/2]. Is the answer -pi/3 because of some negative value clockwise rotation about the unit circle, or is this just some program error?