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if cos(a-b)/cos(a+b) +cos(c+d)/cos(c-d)=0prove thattana.tanb.tanc.tand= -1
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All men dream but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find that it was vanity; but the dreamers of the day are dangerous men, for they may act their dream with open eyes to make it possible. |
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