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why is this wrong (1 Viewer)

kkk579

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why is my working out considered wrong?? the sample answer sheet has a different answer from me although basically the same thing was done. i used the cosine rule instead of the sine rule( which they used on the solutions) but for some reason i got an angle extremely different from the answer on the sample sheet. have i made a mistake i missed out on coz i seriously have no clue what i did wrong.
 

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Hamburgler

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I believe they are wrong because they did not take into the account of the ambiguous case. Your answer is not different at all, 107'33 deg is just 180-72'24.
 

kkk579

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I believe they are wrong because they did not take into the account of the ambiguous case. Your answer is not different at all, 107'33 deg is just 180-72'24.
ohhh okay tysm that’s what i was thinking too but i wasn’t 100% sure
 

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