Question

If a and b are two angles in standard position in Quadrant I, find cos(a-b) for the given function values. sin a=15/17and cos b=3/5
1) -84/85

2) -36/85

3) 36/85

4) 84/85

Answer 1

Answer:

1

Step-by-step explanation:

cosine of sum of 2 angles law

0.98 is answer 84/85

i think it is negative due to the fact that it is in quad I and cos is neg in quad I but I am not 100% on that

Answer 2

Answer:

3)

Step-by-step explanation:

I am one of the maths and they are called BODMAS