Melody

1000cm^3  will equal 1 litre

1cm^3=1ml

I would have called 6 a Hindu-arabic number  :)

I just chose this you tube clip randomly.

There are a lot of resources out there.  This clip looks quite good for a starting point.

No, your number is too big for any ordinary calc to handle!

It depends on where the brackets are meant to be :/

4/x-3+5+2=4/x+(-3+5+2)=4/x+4

Thanks CPhill  

You are always welcome Zegroes :)

$$sin(3\pi -x)=sin3\pi cosx-cos3\pi sinx=0--1sinx=sinx$$

OR

you could just say 

$$sin(3\pi -x)=sin(3\pi-2\pi -x)=sin(\pi -x)=sinx$$

you can factor 5 out of all of them

$$\\ln(xex^2)=ln(ex^3)=lne+lnx^3=1+3lnx$$