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The Trigonometry of Shopping

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Tuition given in the topic of Miss Loi's Temple aka Joss Sticks Tuition Centre from the desk of Miss Loi at 9:10 pm (Singapore time)

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As devotees of The Temple enter the dark, dark period of end-of-year exams and the O-Levels, traces of their past worldly, materialistic lives (which they are supposed to have given up by oath a month ago) tend to show up every now and then:

Shopping & Trigonometry

Don’t forget that minus (-) sign in the last equation after you’ve stopped shopping though.
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