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MathsGee Android Q&A


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Calculate each of the following without the use of a calculator:

(a) \(\cos 80^{\circ} \cdot \cos 10^{\circ}-\sin 80^{\circ} \cdot \sin 10^{\circ}\)

(b) \(\cos 70^{\circ} \cdot \cos 40^{\circ}+\sin 70^{\circ} \cdot \sin 140^{\circ}\)

(c) \(\sin 280^{\circ} \cdot \cos 160^{\circ}-\cos 100^{\circ} \cdot \sin 200^{\circ}\)

(d) \(\cos 265^{\circ} \cdot \sin 355^{\circ}-\sin 85^{\circ} \cdot \cos 175^{\circ}\)

(e) \(\cos 65^{\circ} \cdot \cos 295^{\circ}-\sin 115^{\circ} \cdot \cos 205^{\circ}\)

(f) \(\cos 50^{\circ} \cdot \sin 260^{\circ}+\cos 10^{\circ} \cdot \sin 140^{\circ}\)
in Mathematics by Diamond (75,025 points) | 16 views

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MathsGee Android Q&A

MathsGee Android Q&A