Question

PLS HELP
does anyone know how to solve this?

Answer 1

Answer: -5

Explanation:

5cos 3x60

5cos 60

5 x (-1) = -5

Answer 2

-5

Explanation:

f(x) = 5 cos ( 3x)

f(60) means let x = 60

f(60) = 5 cos ( 3*60)

= 5 cos (180)

= 5 (-1)

= -5