Trigonometry exam question 2018 GCE paper 2 Part 1

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Sir am confused..like y can't we use this method of adding the angles 40 and 79 then subtract by 180 with number of the angled..so I was asking like y have we used sin 40 instead of sin 61?

MonicaChanda-xqtk
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Your video are good but it can be beat if you can be finishing all question just in one video because buddles issues mmm

dannymulemena