Question

Differentiate y= cos2x / x

Answer 1

use the quotient rule

Answer 2

i did.. but get some weird answers

Answer 3

lol ok let me try

Answer 4

ok thx. i first converted cos2x to cos^2 x - sin^2 x , and then i did the quotient

Answer 5

i see it as math procesing error..let me open the browser again

Answer 6

\[\frac{d}{dx}(\frac{\cos2x}{x})=\frac{-2xsin(2x)-\cos(2x)}{x^2}\]

Answer 7

ah..then when am i suppose to conver it.... i always dont know when to convert it to that form

Answer 8

\[=-\frac{2xsin2x+\cos2x}{x^2}\]

Answer 9

ohh, ok thanks for ur help!

Answer 10

:)