Question

4 cos 3 40° - 3 sin 50 degrees is equal to

Answer 1

Answer:

-1/2

Step-by-step explanation:

4 cos3 40  -3sin50

= 4 cos3 40 – 3 sin (90-40)

= 4 cos 3 40- 3 cos40

= cos3.40

= cos 120

= cos(90+30)

=-sin30

=-1/2