Hi. So I just created a question for myself regarding the sine rule for non-right angled triangles and something odd came up. I just needed to do one last thing to get the answer and when I did it, it ended up being 'undefined'. Here is the working out:

Angle C=62 [degrees]

Side c= 7cm

Side b = 8cm

Find angle B:

sin(A)/a=sin(B)/b=sin(C)/c

sin(62)/7=sin(B)/8

(sin(62)/7)*8=sin(B)

sin^-1((sin(62)/7)*8)=B

And when I do that step it says undefined. I tried doing sin(62)/7 first, then doing that *8, then putting all that within the brackets of sin^-1()

Nothing has worked so far... Please help!!!

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