​solve 15...

Dear student
Lt x0  (1+x)13-(1-x)13xgiven limit is of the form 00.so we can LHospitals rule.differentianting numerator and denomenatorlimx0  d(1+x)13-(1-x)13dxdxdx=limx013(1+x)13-13(1-x)13(-1)1=23Regards

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