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A square ABCD of diagonal =2a is folded along diagonal AC, so that planes DAC & BAC are at right angle. The shortest distance between DC & AB in the rew position is |
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Answer» `sqrt(2)a` `F(X)=x("ln" x-1)` `f(x) = "ln"x` `f''(x)=(1)/(x)"",""underset(1)OVERSET(e)(int)((f''+f)sinx)dx` Use integration by parts =`INTF''.sinx+intf.sinx` `=sinx.f']_(1)^(e)-intcosx.f'+f.(-cosx)]_(1)^(e)-intf'.(-cosx)=sinx. "ln"x]_(1)^(e)-x("ln"x-1).(cosx)]_(1)^(e)` |
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