Eric Nicholas K's answer to Ben's Secondary 3 A Maths Singapore question.
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These are my guidelines for solving such equations. Usually the range given is 0 deg < x < 360 deg or 0 rad < x < 2pi rad (sometimes given as <=, less than or equal to).
If the angles given are different, for example, 2x or (3x + 15 deg) instead of x, or if the range given is different, for example, 0 deg < x < 720 deg, then other additional steps are required prior to Step 1.
Fortunately, as an introduction to you for solving such questions for the first time, all the parts in Question 9 are given as angle x, so that you can get used to how to solve such questions before the question gets extended to include a wider range of angles or to include weird angles.
If the angles given are different, for example, 2x or (3x + 15 deg) instead of x, or if the range given is different, for example, 0 deg < x < 720 deg, then other additional steps are required prior to Step 1.
Fortunately, as an introduction to you for solving such questions for the first time, all the parts in Question 9 are given as angle x, so that you can get used to how to solve such questions before the question gets extended to include a wider range of angles or to include weird angles.
Date Posted:
4 years ago
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