Answer :
The Solution.
Step 1:
We shall find the single angle by compound angles formula.
[tex]\cos 60^o\cos 45^o-\sin 60^o\sin 45^o=\cos (60+45)^o=\cos 105^o[/tex]Thus, the required angle is 105 degrees
Step 2:
Presentation of the Answer.
So, the correct answer is 105 degrees.