Sin(A + B) = sinAcosB + cosAsinB
cos(A + B) = cosAcosB - sinAsinB
If sinA = ⅗ and sinB = 5/13 where both angles A & B are in quadrant II. Find sin(A + B).
sinA = ⅗ & cosA = -⅘ and sinB = 5/13 & cosB = -12/13
sin(A + B) = (⅗)(-12/13) + (-⅘)(5/13) = (-36/65) + (-20/65) = -56/65

USING THIS INFORMATION FIND cos(A+B)

the car was traveling 40 mph before it started skidding. ( 2 points ) 17. was the driver were her brakes working at 75% efficiency or better? ( 2 points ) yes 29.

step-by-step explanation:

arc length = 6.63311 ft.

step-by-step explanation:

the formula the arc measure is:

arc length s=2πr(c)/360

where:

c   is the central angle of the arc in degrees

r   is the radius of the arc

π   is pi, approximately 3.142

using the above formula we get

s =

thus we find that arc length of an arc for a circle of radius 20 feet and central angle 19 degrees is

6.63311 feet