AM-2603

Trigonometric equations

A Math · Secondary 4 · Hard · Trigonometric equations

1. $\theta \approx \pm 9.7^\circ,\ \pm 80.3^\circ$
2. $\theta \approx 9.7^\circ,\ 170.3^\circ$
3. $\theta \approx 19.5^\circ,\ 70.5^\circ$
4. $\theta \approx \pm 19.5^\circ,\ \pm 70.5^\circ$

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