10.8k views
1 vote
Cos(11*)cos(19*) - sin(11*) sin(19*)

Write the expression as a function of one number then find it’s exact value.

1 Answer

6 votes

Answer:

√3/2

Explanation:

This is compound angle of cosine

cos(11+19)

=cos(30)

=√3/2

User Ben Jakuben
by
6.5k points