I not understand that so step
"5) DRM - B1 = 56.4 degrees (here i got angle 56.4 from cotangent table - from that link at very beggining of this post - its cotanget 0.661 from 4) )"
how to get 56.4?....
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Parked under the balcony with my U-27 waiting Juliet finish makeup
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