Eric Nicholas K's answer to Annela's Secondary 4 A Maths Singapore question.
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Hi Annela! Here are my workings for part k. At any point if you do not understand my workings or you find my handwriting too small, let me know accordingly and I will rewrite them again!
Date Posted:
4 years ago
Hello thank you for your help but may i know why did you multiply cos A/2 to numerator and denominator for part j and multiply cos A to numerator and denominator for part k?
For this part is the same reason; it’s more of anticipatory than a “must” to do this. Simplifying that tangent expression is tough, but converting it into sine divided by cosine makes the “fraction in fraction” situation difficult to simplify as well, hence my decision to multiply both numerator and denominator by cos in advance.
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