I think the answer would be 28. Hope this helps!
Answer:
cos 78⁰.
Step-by-step explanation:
Use cos 2A = cos^2 A - sin^2 A
so cos^2 39 - sin^2 39 = cos (2*39) = cos 78.
Answer:
11 for the first company and 2 for the second company
Answer:yes
Step-by-step explanation: