Here are my answers for Q10! For part a, carefully apply the trigo identity indicated in red. For part b, use the angle properties of trigo functions (in red) to simplify the expression. Please help to clarify with your school teacher on the sinx = sqrt(-1/2) portion on whether it is acceptable to do what I did.
Here's for Q12i. The same angle properties of trigo functions is applied here, as well as sine rule. Please ignore the crossed out workings on the left as I mistook angle EAB for 20 instead of 2theta. Continue to work on 12ii and 12iii on ur own!
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