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Alkenes · Jun 19, 2012

how can you go from : 2npi/5 +- pi/15 to the following step:

(6n +- 1) pi/15

Sy123 · Jun 19, 2012

Alkenes said:
how can you go from : 2npie/5 +- pie/15 to the following step:

(6n +- 1) pie/15

$\frac{2n\pi}{5}+\frac{-\pi}{15} \\ \frac{6n\pi}{15}+\frac{-\pi}{15} \\ \\ \frac{6n\pi-\pi}{15} \\ \\ \frac{(6n-1)\pi}{15}$

Alkenes · Jun 20, 2012

I don't get how r2 + r1 = 2

help??

Carrotsticks · Jun 20, 2012

Notice the symmetry.

Alkenes · Jun 20, 2012

is cambridge enough for volumes??

Carrotsticks said:
Notice the symmetry.

Alkenes · Jun 20, 2012

yes and how does r2 - r1 = 2(1-y)6(1/2)

Carrotsticks said:
Notice the symmetry.

Carrotsticks · Jun 20, 2012

Alkenes said:
yes and how does r2 - r1 = 2(1-y)6(1/2)

They subbed in the equation found a few lines earlier.

And yes Cambridge is enough for volumes, but I suggest doing questions from a variety of books. Different authors have different question-styles.

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