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{ tg pi/6 * N1 + tg pi/3 * N2=-m*g; ctg pi/6 * N1 + ctg pi/3 * N2=0} solve for N1 and N2
{ tg pi/6 * N1 + tg pi/3 * N2=-m*g; ctg pi/6 * N1 + ctg pi/3 * N2=0} solve for N1 and N2
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