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OpenStudy (anonymous):
3D co-ordinate geometry help http://books.google.co.in/books?id=AwFyDABGAMoC&pg=PA42&lpg=PA42&dq=a+line+makes+angles+with+diagonals+of+a+cube+prove+cos&source=bl&ots=ulCVOrKX1O&sig=bSb4jVUU2ybn4P9PXxE_9m2Nkto&hl=en&sa=X&ei=-2Q-UriTA8HXrQf8pYCgBQ&ved=0CDoQ6AEwAg#v=onepage&q=a%20line%20makes%20angles%20with%20diagonals%20of%20a%20cube%20prove%20cos&f=false
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OpenStudy (anonymous):
one step before---(1)
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