G The equation d f" (0 ) sing + f (@ ) cos 8 da / ( x , 0 ) Fi ( o ) cos o - f (0 ) sing gives a formula for the derivate y' of a polar curve (8) = f(9 ). The second derivativeis day - dy / do -find 12 2 da / do the slope and concavity of the following curve at the given points. 8 = 6 sin 0, 0= / ,7/3 the curve at