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Beginner calculus question... (2 Viewers)

Sy123

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There's an in built editor here? I dont see the 'function' button that they use to have....

Well you have to bound the commands with the commands

[$tex] and at the end [/tex$]

There are NO dollar signs here. I just did that otherwise it will think Im writing latex
 

Peeik

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Well you have to bound the commands with the commands

[$tex] and at the end [/tex$]

There are NO dollar signs here. I just did that otherwise it will think Im writing latex
ahhhhh i see what you mean now.....and you just put the latex coding in between there?
 
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For y=x^3 find dy/dx at x=1??

Don't use first principles. It's slow, inefficient and prone to mistakes (especially when working with higher powers).
Use this rule: if f(x)=x^n then f'(x)=nx^(n-1)

Now...
y=x^3
dy/dx = 3x^2 and now sub in x=1
= 3 X 1^2
= 3
 

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