EM-1430

Sine and cosine of obtuse angles

E Math · Secondary 3 · Medium · Sine and cosine of obtuse angles

1. $25.0^\circ$ and $155.0^\circ$
2. $25.0^\circ$ and $335.0^\circ$
3. $65.0^\circ$ and $115.0^\circ$
4. $205.0^\circ$ and $335.0^\circ$

Sign in to check your answer and see the hint and the worked explanation. Free on PrepLab High.