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這個不是特殊角,只能運用查錶或者小算盘求解 2度51分43秒=2+51/60+43/3600=2.8619º; sin(2.8619°)=0.0499 cos(2.8619°)= 0.9988 tan(2.8619°)= 0.04999 cot(2.8619°)= 20.0035
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