evaluate 6sin20°-8sin^3 20°
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6 ×0.34 --- 8 (0.34)^3=2.04 --- 8×(0.34)^3
=2.04 - 8×0.04=2.04 - 0.32 =1.72
=2.04 - 8×0.04=2.04 - 0.32 =1.72
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