If angle x is in the fourth quadrant and angle y is in the first quadrant, the value of cos(x-y) is

-y) = cos x cos y + sin x sin y becomes, in terms of sign,

         cos(x-y) =   (Note that cos(x-y) = cos x cos y + sin x sin y.

If angle x is in the fourth quadrant, then sin x is positive and cos x is negative.

If angle y is in the first quadrant, then sin y is positive and cos y is positive.

Then cos(x-y) becomes, in terms of sign:

                                        (-)(+) + (+)(+), or

                                          (-)   +   (+)

This would be positive, overall, if cos x cos y < sin x sin y.

1/2

Step-by-step explanation: I got this right on Edmentum.

hey seth! : )

i’m not 100% sure, but i think it’s b

hope this ya : p

miss u!

- nicole

45

step-by-step explanation: