4.3 Maxima and Minima

[@jparker3163]

13:26 isn't it supposed be -2cos(x)sin(x)?

[@dontbestumped]

is it still the same process since derivative of cosx is -sinx

[@austingraham9734]

yes because both sinx=0 and -sinx=0 equal (pi)(n)

[@al-maalaalmaawali260]

DREVITIVE of cos is -sin ????