# ib trig question!!! HELP NEEDED!!! THANK YOU!!

#### luciaaa

##### New member
The question is in the file! Plzzz help me out! I've literally been working on this question for half an hour...
Thanks a lot!

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#### Subhotosh Khan

##### Super Moderator
Staff member
The question is in the file! Plzzz help me out! I've literally been working on this question for half an hour...
Thanks a lot!

View attachment 13192
If I were to do this problem:

1) A + B + C = 180 ............. so sin(A) = sin(B+C)

2) attack Left-hand-side and simplify the numerator and continue.......

#### luciaaa

##### New member
If I were to do this problem:

1) A + B + C = 180 ............. so sin(A) = sin(B+C)

2) attack Left-hand-side and simplify the numerator and continue.......
thanks!! But I still can't seem to get the answer. I don't know what to do with the right hand side...

#### Subhotosh Khan

##### Super Moderator
Staff member
thanks!! But I still can't seem to get the answer. I don't know what to do with the right hand side...
Leave the RHS alone for the time being continue to simplify LHS. Tell us what do you get.

#### luciaaa

##### New member
Leave the RHS alone for the time being continue to simplify LHS. Tell us what do you get.
I reached cosBcosC=sinBsinC, but I don't know what to do after this. I put tanB as sinB/cosB to get this.

#### luciaaa

##### New member
Leave the RHS alone for the time being continue to simplify LHS. Tell us what do you get.
Never mind, I got the answer!! Turns out i was doing it right all along, except that i forgot an essential formula. Thanks again for your help, i really needed it