Eric Nicholas K's answer to Darren's Secondary 3 E Maths Singapore question.
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Even though your stated topic is E Maths, there is one concept that you will need from A Maths. The product of the gradients of two perpendicular lines is -1.
Date Posted:
4 years ago
This question is definitely more suited for A Maths than for E Maths, even though the concepts are common to both (except for the perpendicular part).
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