## onegirl Group Title Find the derivative of f(x) tan 3x - csc 4x. one year ago one year ago

1. Twis7ed Group Title

So you mean$\frac{ d }{ dx }(\tan3x-4x)*\frac{ d }{ dx }(3x)*\frac{ d }{ dx }(4x)$?

2. onegirl Group Title

no the derivative of tan 3x - 4x...the multiplying part is the directions

3. onegirl Group Title

hold on wait its tan 3x - csc 4x

4. onegirl Group Title

its tan 3x- csc 4x i miss typed it

5. Twis7ed Group Title

6. Twis7ed Group Title

And what part of the equation is inside the tan? Is it tan(3x)-4x or tan(3x-4x)

7. onegirl Group Title

No not the correct answer i need to find the derivative of that and it says to multiply the derivatives of 3x and 4x into the promblem

8. onegirl Group Title

its tan 3x - csc 4x thats how it written

9. Hoa Group Title

@onegirl Please, post the right question. I confuse, too

10. onegirl Group Title

okay hold on

11. onegirl Group Title

let me edit my original question

12. onegirl Group Title

there do you guys see it now?

13. Hoa Group Title

yes. i think Twis7ed will guide you well.

14. onegirl Group Title

ok

15. Twis7ed Group Title

Oh, ok, so$\frac{ d }{ dx }(\tan 3x - \csc 4x)=\frac{ d }{ dx }\tan3x - \frac{ d }{ dx }\csc4x$ From that you know that $\frac{ d }{ dx }\tan3x = 3\sec^2(3x)$ and that $\frac{ d }{ dx }\csc4x=-4\cot(4x)\csc(4x)$so you end up with$\frac{ d }{ dx }(\tan3x-\csc4x)=3\sec^2(3x)+4\cot(4x)\csc(4x)$

16. Twis7ed Group Title

^Do you understand that?

17. Hoa Group Title

it's the best

18. onegirl Group Title

yes, so i dont have to multiply the derivatives of 3x and 4x into the whole problem?

19. onegirl Group Title

yes i understood what you wrote/

20. Twis7ed Group Title

I'm not sure, what is the entire question?

21. onegirl Group Title

Okay so I found the derivative of that and my teacher told me to multiply 3x and 4x into it here is how i did it hold on

22. onegirl Group Title

d/dx (tan(3)x - csc 4x = tan(3) - csc 4

23. onegirl Group Title

i think i understnad where i went wrong now after seeing what you showed

24. Twis7ed Group Title

ALright, just try to remember that when you have a trig function you usually use the chain rule with the function and then the function inside of it and it should be easy :)

25. onegirl Group Title

okay thanks