Question

.

Answer 1

let cos theta = x
so replace all cos with x \[\huge\rm (x-x)^2+(x+x)^2\] now solve

Answer 2

how did you get D ?

Answer 3

try again...
you don't have to use a calculator
it's just like (2-2)^2+ (2+2)^2

Answer 4

16?

Answer 5

do you mean (2-2)^2+(2+2)^2 = 16 ??

Answer 6

Yeah

Answer 7

yeah right ...

Answer 8

\[\huge\rm \color{ReD}{(x-x)^2}+(x+x)^2\] now solve
x-x= ??
x+x= ??
solve the parentheses

Answer 9

x-x=0
x+x=2x

Answer 10

yes right \[\huge\rm \color{ReD}{(0)^2}+(2x)^2= ??\]

Answer 11

2x(2x)=4x^2

Answer 12

So the answer is B?

Answer 13

yes right now replace x with cos theta = answer

Answer 14

Thank you!

Answer 15

my pleasure

Answer 16

Hey Vera its me starlord6200