Answer:
Step-by-step explanation:
Answer:
B
Step-by-step explanation:
Pls mark brainliest
First let's find the angles a and b.
We have then:
sin a = 4/5
a = Asin (4/5)
a = 53.13 degrees.
cos b = 5/13
b = Acos5 / 13
b = 67.38 degrees.
We now calculate cos (a + b). To do this, we replace the previously found values:
cos ((53.13) + (67.38)) = - 0.507688738
Answer:
-0.507688738
Note: there is another way to solve the problem using trigonometric identities.
You just simplify 80/150. After you divide both by sides by 10 you get 8/15 which is its simplist form.
Answer:
2.5
Step-by-step explanation:
