EM-3095

Sine and cosine of obtuse angles

E Math · Secondary 4 · Hard · Sine and cosine of obtuse angles

1. $40.0^\circ$ or $140.0^\circ$
2. $40.0^\circ$ only
3. $50.0^\circ$ or $130.0^\circ$
4. $220.0^\circ$ or $320.0^\circ$

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