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SingaporeAdditional MathematicsQuick questions

Trigonometry and Identities

Quick questions on Solving trigonometric equations: N(A)-Level Additional Mathematics

5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is wrong quadrants for the sign?
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Match the sign to the correct pair of quadrants using "All, Sine, Tangent, Cosine".
What is solutions outside the range?
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Discard any angle that falls outside the stated interval, and add 360∘360^\circ to reach any missing ones inside a wider range.
What is q1?
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Solve cos⁡x=0.5\cos x = 0.5 for 0∘≤x≤360∘0^\circ \le x \le 360^\circ. [2 marks]
What is q2?
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Solve tan⁡x=1\tan x = 1 for 0∘≤x≤360∘0^\circ \le x \le 360^\circ. [2 marks]
What is q3?
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Solve sin⁡x=0\sin x = 0 for 0∘≤x≤360∘0^\circ \le x \le 360^\circ. [2 marks]

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