Question

Verify the identity.
(cos x + sin x)^2 = 1 + 2 cos x sin x

Answer 1

Expand the left side. You will see what will happen. :)
Or do I need to show it to you?

Answer 2

could you show me

Answer 3

wait would it be like this.
(cos x + sin x)²
= sin²x + 2sin(x)cos(x) + cos²x
= (sin²x + cos²x) + 2sin(x)cos(x)
1 + 2sin(x)cos(x)

Answer 4

or is that worng

Answer 5

Yes! You actually got it. :))

Answer 6

ok i really did think that i had it wrong.

Answer 7

Just don't be afraid. :))

Answer 8

im just so lost with all of this thanks.

Answer 9

No worries. :)