Here's the question you clicked on:
arifadli8
please show me derivative of sec ^2 x
Which incidentally, is also the derivative of tan²x, illustrating quite elegantly that two functions having the same derivative are not necessarily the same function :D
why u use chain rule not quotient rule????
Many paths to the top of the mountain, Champ ;) Some of them steeper, or rockier than the others, but all having the same destination.
then how u get the tan x???
Besides, using quotient rule will have you using chain rule anyway :D
tan²x and sec²x have the same derivative, well, because... sec²x = tan²x + 1