Help! sin(α - β) problem!

(picture attached)

I don't know what to do.. I tried doing..
sin((-4/5)-(5/12)) and getting an answer, but none of my answers matched up with my options. Thanks!

Question

Help! sin(α - β) problem!

(picture attached)

I don't know what to do.. I tried doing..
sin((-4/5)-(5/12)) and getting an answer, but none of my answers matched up with my options. Thanks!

anonymous · Answer

attachment

anonymous · Answer

I assume it would be negative since sin is negative in Quad III
Right?

anonymous · Answer

see ur given sin a and tan b...

u find out the value of cos alpha and cos beta from this..

then use the equation sin(a+b) = sina cosb + sinb cosa 

then put the values and u'll get the answer

anonymous · Answer

alpha= a and beta= b

anonymous · Answer

how do I find sin(beta) and tan(alpha)?