a stands for alpha b stands for beta

a)cos(a+b)= b)2cos squared a - 1=

c)tan2a= d)sin1/2theta=

e)sin a=

1+ cos a

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- Jul 14th 2008, 11:35 AMDave19trig identities
a stands for alpha b stands for beta

a)cos(a+b)= b)2cos squared a - 1=

c)tan2a= d)sin1/2theta=

e)__sin a__=

1+ cos a - Jul 14th 2008, 01:39 PMtopsquark
For a) - d) use the link I gave in your other thread.

For e) what are you looking for? This is

$\displaystyle \frac{sin(a)}{1 + cos(a)}$

right? There are any number of equivalent forms that we might create from this. I'm not sure which one you would be looking for?

-Dan