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2. tan 210 = tan(180 + 30) = tan 30 = 1/3√3
3. sin 7/6π = sin 210 = sin(180 + 30) = - sin 30 = -1/2
4. cos 1.230 = cos(3.360 + 150) = cos 150 = cos(180 - 30) = -cos 30 = -1/2√3
5. cos 265 = cos(270 - 5) = - sin 5 = -p