Question

Simplify: (sin Θ − cos Θ)2 + (sin Θ + cos Θ)2

Answer 1

let sinx = x
cos x= y \[\huge\rm (x-y)^2 +(x+y)^2\]
(x-y)^2 is same as (x-y)(x-y) apply foil method

Answer 2

familiar with the foil method ?

Answer 3

hm could you help me out a little bit more

Answer 4

alright so foil (x-y)(x-y)
here is an example a(b+c)
multiply both terms by a
a times b+a times c

Answer 5

first multiply 2nd parentheses by x
and then multiply by -y