Posted by 123university on .
Factor each expression:
cos^2x 2cosx+1
4cos^2x1

trig 
Damon,
call z = cos x
z^2 2z +1
(z1)(z1)
so
(cosx1)(cosx+1)
4z^21
(2z1)(2z+1)
(2cosx1)(2cosx+1)
Posted by 123university on .
Factor each expression:
cos^2x 2cosx+1
4cos^2x1
call z = cos x
z^2 2z +1
(z1)(z1)
so
(cosx1)(cosx+1)
4z^21
(2z1)(2z+1)
(2cosx1)(2cosx+1)