#1

I need help with hw again UG, lol.

I'm using the half-angle identity formulas to solve equations.

so far i need

Sin 67.5 (degrees)

It would be hard to write out the formula and such, but i've gotten it down to

SQRT((1+(SQRT(2)/2)/2)

it looks crazy there, but is pretty straight forward on paper, my problem comes with just going through the math, how the eff do i solve for that? i know i set up the problem correctly (the only potential problem is the positive or negative with the cos of 135. It's negative but...

the formula says 1 - cosx, so 1 - (-SQRT(2)/2) = 1 + SQRT(2)/2)

<edit>: OH. forgot to mention... it needs to be an exact answer, no calculator ez-ness here

I'm using the half-angle identity formulas to solve equations.

so far i need

Sin 67.5 (degrees)

It would be hard to write out the formula and such, but i've gotten it down to

SQRT((1+(SQRT(2)/2)/2)

it looks crazy there, but is pretty straight forward on paper, my problem comes with just going through the math, how the eff do i solve for that? i know i set up the problem correctly (the only potential problem is the positive or negative with the cos of 135. It's negative but...

the formula says 1 - cosx, so 1 - (-SQRT(2)/2) = 1 + SQRT(2)/2)

<edit>: OH. forgot to mention... it needs to be an exact answer, no calculator ez-ness here

*Last edited by Shanky2563 at Mar 3, 2009,*