# Forming integrals in Latex

I dont even know how to put integration signs on this someone help, this is ridiculous lol

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tiny-tim
Homework Helper
Do you mean you want to type $$\int_a^b$$ ?

If so, you just type [noparse]$$\int_a^b$$[/noparse].

no there are no boundaries

Nvm I cant even write the integral sign im not going to show all my workings

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$$\int$$y^7e^y^4dy

let u =y^7, du=y^8/8 dv=e^y^4 let w=y^4, dw=4y^3dy, 1/4dw=y^3dw

v=1/4 $$=int$$ e^w dw
=(y^7)(1/4e^y^4) - (1/4)(1/8) $$\int$$ y^8 e^y^4

It doesnt seem like ive made this any simpler at all?

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tiny-tim
Homework Helper
erm … to get
$$\int y^7e^y^4dy$$

let $$u =y^7, du=y^8/8 dv=e^y^4 let w=y^4, dw=4y^3dy, 1/4dw=y^3dw\,,$$​

type
[noparse]$$\int y^7e^y^4dy$$

let $$u =y^7, du=y^8/8 dv=e^y^4 let w=y^4, dw=4y^3dy, 1/4dw=y^3dw\,,$$[/noparse]​

You see, you must put [noparse]$$and$$[/noparse] around the whole of your formula, not just the \int.

And you must always put the \ before the int.

I suggest you "bookmark":
http://www.physics.udel.edu/~dubois/lshort2e/node61.html#SECTION008100000000000000000 [Broken]
and maybe
http://www.physics.udel.edu/~dubois/lshort2e/node54.html#SECTION00830000000000000000 [Broken]​

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rock.freak667
Homework Helper
$$\int y^7e^{y^4} dy$$

Let $w=y^4 \Rightarrow \frac{dw}{dy}=4y^3 \Rightarrow \frac{dw}{4}=y^3 dy$

$$\int y^7e^{y^4} dy \equiv \int (y^4)e^{y^4} (y^3 dy) \equiv \int \frac{1}{4} we^w dw$$

Easier now.