IM DYING this is the last question someone please help !!
(Cos theta - cos theta )^2 + (cos theta + cos theta)^2

Question

IM DYING this is the last question someone please help !! 
(Cos theta - cos theta )^2 + (cos theta + cos theta)^2

anonymous · Answer

@Hero !!! Please I need your intelligence!!

anonymous · Answer

@mathmale !!

anonymous · Answer

$$\cos^2(θ)+\cos(θ)$$

jdoe0001 · Answer

hmmm

campbell_st · Answer

well expand them they are both perfect squares

(a + b)^2 = a^2 + 2ab + b^2

(a - b)^2 = a^2 - 2ab + b^2

that's all that is needed, then collect like terms

jdoe0001 · Answer

$\bf (a-a)^2+(a+a)^2\implies ?$

anonymous · Answer

Can you explain please? My teacher gets irritated when I don't understand assignments

anonymous · Answer

The first two would cancel right ?

jdoe0001 · Answer

yes

campbell_st · Answer

but the question doens't make a lot of sense 

since the 1st brackets is basically 

(a - a)^2  = 0

and the 2nd is 

(a + a)^2 = 4a

jdoe0001 · Answer

well   4$a^2$  but essentially that's all there is

anonymous · Answer

Would it be 4cos^2 theta ?????

larseighner · Answer

That is what it looks like, by I am not sure you stated your problem correctly.