Eric Nicholas K's answer to Shan Kuek's Secondary 3 A Maths Singapore question.
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The first one. This gets very difficult to explain on paper. You will need to know how the Quadrants and their angles work and you also need to know the values of some trigonometric ratios (sin, cos, tan) of special angles such as 0, 30, 45, 60 and 90 (and their equivalent in radians).
Date Posted:
4 years ago
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