Question

Determine all interval(s) on which f is decreasing...

Answer 1

find the derivative of the function

Answer 2

set it equal to 0, and those are ur critical points

Answer 3

put them on a line, pick values before, between and after the points, plug those values into the derivative function, see if they're positive of negative, and u have ur intervals...

Answer 4

@11calcBC critical points: 11pi/12, 7pi/12, -pi/12, -5pi/12

Answer 5

and the derivative is 1+2sin(2x)

Answer 6

so what would I get if I plugged in, let's say, 8pi/12, which is between 7pi/12 and 11pi/12
?