Question

if sin a is a given amount, and sin b is a given amount, then what quadrant is a+b in?

Answer 1

what is given amount?

Answer 2

I think it wont be in a quadrant but rather the x axis. IDK tho lol.

Answer 3

cos a = -4/5
cos b = 8/17
sina=-3/5
sinb=-15/17
a is in quadrant 3
b is in quadrant 4

Answer 4

from the given quantities find out the values of both cos(a+b) and sin(a+b). Then, depending on the signs of the values you get, you can determine the quadrant in which (a+b) lies.

Answer 5

thank you!