For positive acute angles A and B, it is known that sin A = 4/5 and cos B = 45/53. Find the value of cos (A - B) in simplest form.

1. d.90

2. e. none of these (80)

3. a. 0

4. b. 6

5. e. none of these (10)

6. a. 5

step-by-step explanation:

why? because i noticed a pattern. 60 120. those numbers without the zero, make the 6 times tables leaving your answer to be b since 6 times 4 is 24 and adding a zero making it 240.

if the angular bisector of an triangle bisects the opposite side, prove that the other two sides are equal.