Question

3
10. If cos a=3/5

cos B =4/5

find the value of cos
a-B
2
assuming a and B to be acute angles
​

Answer 1

Answer:

-1/5

Step-by-step explanation:

A = 3/5cos-1

B = 4/5cos-1

a-b

(3/5cos-1) - (4/5cos-1)

-1/5cos-1

-1/5 = cos