Snap summary of tests using $y'$ and $y''$ (for inflexions)

$y'$ TEST: STATIONARY POINTS - NATURE

REMARK ROW 1 - HORIZONTAL INFLEXION

REMARK ROW 2 - HORIZONTAL INFLEXION

REMARK ROW 3 - MINIMUM TURNING POINT

REMARK ROW 4 - MAXIMUM TURNING POINT

$y''$ TEST FOR AN INFLEXION:

REMARK ROW 5 - CONFIRMED INFLEXION

REMARK ROW 6 - CONFIRMED INFLEXION

REMARK ROW 7 - NOT AN INFLEXION

REMARK ROW 8 - NOT AN INFLEXION