Express as a trigonometric function of one angle. cos 140 cos 520 - sin 140 sin 520

cos(300)

Step-by-step explanation:

you must use the identity:

cos(a+b)=cos a cos b - sin a sin b

In this case a=140 and b=540. Hence, the answer is

cos(140+520)

or

cos(660)

However,   it's about a round and a half to the circle,

hence, 660 is the same as 660-360=300.

Finally, the answer is cos(300)

choose (5, 1.5) and (-1.5,-3.5)

step-by-step explanation:

5 - 1.5 =3.5

-1.5 - (-3.5) = 2

3.5 + 2 =5.5

hope this !