Question

Can I get an explanation please? Thanks!
derivative of tan2x = cos3y

Answer 1

When finding the derivative of a trig function, why do you take the derivative of the inside as well?

Answer 2

O no its saifoo.khan lol

Answer 3

Aww how sweet lol

Answer 4

you take the derivative of the inside because you're using chain rule

Answer 5

But it isnt to a power, can you explain the chain rule/

Answer 6

watch this http://www.youtube.com/watch?v=6kScLENCXLg

Answer 7

The problem is why dont you do the chain rule with cos3y?
I thought it was -sin3y x 3 but theres no 3...

Answer 8

the answer is
-3sin3y

Answer 9

you have already done the chain rule -sin3y x 3 the 3 go in front of the -sin3y x 3
-3sin3y

Answer 10

the answer says that it is not -3sin3y just -sin3y

Answer 11

what's with the tan2x in your first post?

Answer 12

the answer cannot be just -sin3y

Answer 13

you are right. textbook must be wrong. Thanks