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secondary 3 | A Maths
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Ahmad mirza
Ahmad Mirza

secondary 3 chevron_right A Maths chevron_right Singapore

HI can someone please help me with 10 and 12. Thanks in advance

Date Posted: 1 week ago
Views: 9

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Ang Yew Keong
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1st
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.
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Ang Yew Keong
Ang Yew Keong's answer
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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!