Question

HEY! Can someone factor out D and E for me?

Answer 1

if you called cosx A and sin x B
could you solve
A*B - 2*A=0
?

Answer 2

you could re-write
AB-2A=0
as
A(B-2)=0
what value of A makes this zero? what value of B makes it 0?

Answer 3

but their cant be anything on the outside. it has to be like
(a-c)(a+c)