## anonymous one year ago Use the rules of differentiation to find the derivative of the function y=.7x=3cosx

1. anonymous

2. anonymous

what do you mean?

3. anonymous

y=.7x=3cos x

4. anonymous

is it .7x=3cos x or .7x-3cosx

5. anonymous

it is y = .7x = 3cosx

6. anonymous

to me it is not correct. can you tell me the answer so that i can check if there is any change in statement?

7. anonymous

8. anonymous

can you try a different one and i can figure out the process?

9. anonymous

$\frac{ dy }{ dx }=.7=-3 \sin x$

10. anonymous

how would i do it for y= $3\div \sqrt[4]{x}-7sinx$

11. anonymous

$y=\frac{ 3 }{ x ^{\frac{ 1 }{ 4 }} }-7 \sin x=3x ^{\frac{ -1 }{ 4 }}-7 \sin x$ $\frac{ d }{ dx }\left( x^n \right)=nx ^{n-1}$ $\frac{ d }{ dx }\sin x=\cos x$

12. anonymous

$\frac{ dy }{ dx }=3*\left( -\frac{ 1 }{ 4 } \right)x ^{\frac{ -1 }{ 4 }-1}-7\cos x$ ?

13. anonymous

okay thank you

14. anonymous

yw