- #1
aisha
- 584
- 0
I was never taught how to do this I was just given problems with no solutions so I don't know what to do can someone please help me I have two questions which are similar maybe if I get help with one I can solve the other one on my own.
It says simplify the following
[tex] \cos(\pi+x) + \cos (\pi-x) [/tex]
for this one i expanded cos into the brackets and simplified and got 2cospi is this correct?
and
[tex] \cos (\frac {7\pi} {10}) \cos (\frac {\pi} {5}) +\sin (\frac {7\pi} {10}) \sin (\frac {\pi} {5}) [/tex]
Help please quick!
It says simplify the following
[tex] \cos(\pi+x) + \cos (\pi-x) [/tex]
for this one i expanded cos into the brackets and simplified and got 2cospi is this correct?
and
[tex] \cos (\frac {7\pi} {10}) \cos (\frac {\pi} {5}) +\sin (\frac {7\pi} {10}) \sin (\frac {\pi} {5}) [/tex]
Help please quick!
Last edited: