Find the extreme points of the following functions. Specify if the extremum is a maximum or minimum. Find the extreme values. `y` =
`4cos2x - 3sin2x,x in (-pi/2, pi/2)`

Answer

min. at `x = (pi)/(2) - (1)/(2) tan^(-1) ((3)/(4))`, min value = -5 and max. at `x = - (1)/(2) tan^(-1) ((3)/(4))`, max value = 5