Thread: simplify

how do i simplify this:
(sin^2(a)+2cos(a)-1)
and make it into
(2cos(a)-cos^2(a))

use

can you explain more please.
how do i get cos^2?
i only got sin^2

From the given identity(in post #2) of course. use it to define sin^2 using cos^2. Come on, can't be more helpful

wow, i still can't get it, can you elaborate please

Originally Posted by ahmedb

wow, i still can't get it, can you elaborate please

Surely if then

Substitute this in place of .


You've asked very similar questions in about four different threads, surely you have learnt something by now...

yes i did