Question

Evaluate cos220cos40 + sin220sin40

Answer 1

are you looking for the answer in terms of radians, degrees, or just reagular numbers?

Answer 2

I honestly don't know. It doesn't say. Probably either degrees or regular numbers.

Answer 3

220 - 40 = 180, that's gotta be a part of it, doncha think?

Answer 4

thats probable

Answer 5

ok man look in the back of ur book for questions next to this

Answer 6

see what its asking for

Answer 7

okay, cos(-40) = cos(40)
and cos(a+b) = cos(a)cos(b) - sin(a)sin(b)...

Answer 8

... so (a+b) = 220 + -40

Answer 9

ohhh. thank you so much! I missed class today and my teacher just gave me the notes so I was a little confused! Thank you!

Answer 10

not to be petty, but my friend and I are competing for medals...