Ok So i finished my questions and was wondering if someone could check my work to see if i did it right. Question: If CosA= 1/3, with 0<A<pie/2, and SinB=1/4, with pie/2<B<pie, Calculate sin(A+B) My Solution: Sin(A+B)= SinACosB + CosASinB =SinACosB + (1/3)(1/4) SinACosB + 1/12 Ok Now i drew Triangle A and labeled the bottom 1 and hypotaneous 3. Then used the theorum to get the last side is square root 8. I made Triangle B and labelled hypotaneous 4, adjacent side being 1 and used theorum to get the opposite side to be square root of 15. =(square root8/3)(square root15/4) +1/12 =(square root120/12) + 1/12 to get my final answer of squareroot 120 +1 /12. Is that correct?