If sin a= 12/13 in quad. 2 , cos b=-4/5 quad 3, how do i find sin (a+b) ?

Therefore

Step-by-step explanation:

Given:

To Find:

Solution:

Using identity,

Now Substitute Sin a we get

As 'a' is in Second Quadrant Cos a is Negative

Similarly,

Now Substitute Cos b we get

As 'b' is in Third Quadrant Sin b is Negative

Now Using Identity

Substituting the values we get

Therefore

the answer is b.

step-by-step explanation:

by the trigonometric ratio tangent, tangent equals opposite divided by adjacent.

therefore, tan(50) equals ac/3

multiply each side by 3 to get: ac=3tan(50)

the answer is b.