Question

Find cos 105 using cos (a+b)=cos a Cos b - sin a sin b
With steps please

Answer 1

105 can divided into 60+45 so
plugin in formula

Answer 2

I suck at math so.... Can you like do it for me :)

Answer 3

sin 60 =?
sin 45=?
cos 60=?
cos 45=?

Answer 4

tell me the values

Answer 5

Cos 30
Cos45
Sin30
Sin45

Answer 6

Is it right?

Answer 7

nope its 60

Answer 8

Everything?

Answer 9

nope instead of 30

Answer 10

cos 60 Cos 45 - sin 60 sin 45