Arectangular banner has a length of 4 ft and a width of 15 ft what is the area of the banner

60 ft^2

Step-by-step explanation:

area of a rectangle: length x width

4 x 15 = 60

60 ft.

Step-by-step explanation:

The formula to find the area of a rectangle is A=L×W. A is the area. L is the length. W is the width. 4×15=60.

cos x (2 sin x − 1)

Step-by-step explanation:

sin(2x) − cos x

Use double angle formula.

2 sin x cos x − cos x

Factor.

cos x (2 sin x − 1)