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C1 Differentiation Help Needed

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Reply 20

iCiaran

Original post by Robert Green

If i differentiate dy/dx again i get

Screen Shot 2012-10-21 at 17.31.11.png

See i get how the 9x^-4 could become 9 / x^4

but i fail to see how the one becomes x^4?

What does

\frac{x}{x}

equal?

Reply 21

Abject Testament

Original post by Robert Green

If i differentiate dy/dx again i get

Screen Shot 2012-10-21 at 17.31.11.png

See i get how the 9x^-4 could become 9 / x^4

but i fail to see how the one becomes x^4?

Anything divided by itself is 1 do you agree?

Reply 22

Robert Green

Original post by iCiaran

What does

\frac{x}{x}

equal?

1? But i still cant see why:

Screen Shot 2012-10-21 at 17.41.07.png

becomes

Am i just allowed to change the 1 to x^4

Because

X^4 / x^4 = 1?

Reply 23

Abject Testament

Original post by Robert Green

1? But i still cant see why:

Screen Shot 2012-10-21 at 17.41.07.png

becomes

Am i just allowed to change the 1 to x^4

Because

X^4 / x^4 = 1?

Yes.

\frac{x^4}{x^4}-\frac{9}{x^4}

Reply 24

mofgod

Original post by Robert Green

1? But i still cant see why:

Screen Shot 2012-10-21 at 17.41.07.png

becomes

Am i just allowed to change the 1 to x^4

Because

X^4 / x^4 = 1?

Right.

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C1 Differentiation Help Needed

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