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`(l_(1)alpha_(2)+l_(2)alpha_(1))/(l_(1)+l_(2))``(l_(1)alpha_(1)+l_(2)alpha_(2))/(alpha_(1)+alpha_(2))``(l_(1)alpha_(1)+l_(2)alpha_(2))/(l_(1)+l_(2))``(l_(2)alpha_(1)+l_(1)alpha_(2))/(alpha_(1)+alpha_(2))`

Answer :

CSolution :

`l_(1) (1+alpha_(1) DeltaT) +l_(2)(1+alpha_(2)DeltaT) = l_(1)` <br> `l_(1) = l_(1) +l_(2) +(l_(1)alpha_(1) +l_(2)alpha_(2)) DeltaT` <br> `l_(1) = (l_(1)+l_(2)) (1+(l_(1)alpha_(1)+l_(2)alpha_(2))/(l_(1)+l_(2))DeltaT)`