Bern Ong @ 88Tuition's answer to Sonia's Secondary 4 A Maths Singapore question.
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Keep Trying, you can do it;)
Date Posted:
4 years ago
One correction. Cos theta/2 cannot stay +-. This is because theta/2 is guaranteed to be between 90 and 135 and so its cosine will have a negative value.
Good Catch, Thank you Eric. ;)
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