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I have some questions that I am struggling with understanding, can someone show the workings out and the answer to these please?

 

1.

If  y=e^6x 

Find  d(e^6x)/d(x)

 

2.

Find d(sin(6x))/d(x)

 Mar 7, 2015

Best Answer 

 #1
avatar+118723 
+5

1.

If  y=e^6x 

Find  d(e^6x)/d(x)

 

$$\\y=e^{6x }\\\\
\frac{dy}{dx}=6e^{6x }$$

 

-------------------------------------------

 

$$\\\frac{d}{d(x)}(sin(6x))\\\\
=6cos(6x)\\\\\\
$let me see if I can do this formally using the chain rule$\\\\
y=sin(6x)\\\\
let\;\; u=6x \qquad so \qquad \frac{du}{dx}=6\\\\
y=sin(u)\qquad so \qquad \frac{dy}{du}=cos(u)\\\\
\frac{dy}{dx}=\frac{dy}{du}\times \frac{du}{dx}\\\\
\frac{dy}{dx}=cos(u)\times 6\\\\
\frac{dy}{dx}=cos(6x)\times 6\\\\
\frac{dy}{dx}=6cos(6x)\\\\$$

 Mar 8, 2015
 #1
avatar+118723 
+5
Best Answer

1.

If  y=e^6x 

Find  d(e^6x)/d(x)

 

$$\\y=e^{6x }\\\\
\frac{dy}{dx}=6e^{6x }$$

 

-------------------------------------------

 

$$\\\frac{d}{d(x)}(sin(6x))\\\\
=6cos(6x)\\\\\\
$let me see if I can do this formally using the chain rule$\\\\
y=sin(6x)\\\\
let\;\; u=6x \qquad so \qquad \frac{du}{dx}=6\\\\
y=sin(u)\qquad so \qquad \frac{dy}{du}=cos(u)\\\\
\frac{dy}{dx}=\frac{dy}{du}\times \frac{du}{dx}\\\\
\frac{dy}{dx}=cos(u)\times 6\\\\
\frac{dy}{dx}=cos(6x)\times 6\\\\
\frac{dy}{dx}=6cos(6x)\\\\$$

Melody Mar 8, 2015

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