Question

Cosine function help please

Answer 1

@jim_thompson5910 @hero @campbell_st

Answer 2

are you familiar with the unit circle?

just plug in all the values that they give you in the first part and look to see if the outcome is equivalent to the corresponding value

Answer 3

You could use elimination method

cos 0 =3 is only possible for last 2 options

Answer 4

Now cos pi/4=0

Answer 5

Check whether c or d satisfies this

Answer 6

What I'm confused about is whether i plug in those values for theta, or what do I plug them in?

Answer 7

when it says 'cos pi/4'

pi/4 is theta

Answer 8

Cool, so I got the last option as my answer, is that correct?

Answer 9

yes

Answer 10

Thanks guys :)

Answer 11

please click best response if that helped

Answer 12

Btw I would give medal to u both but since rob has a lot less ill give it to him

Answer 13

ok :)