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Q.

If y=ex+e-x,  then  dydx is equal to

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a

ex-e-x2x

b

ex-e-x2x

c

12xy2-4

d

12xy2+4

answer is A.

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Detailed Solution

dydx=ex2x-e-x2x=ex-e-x2x                =ex+e-x2-42x                 =y2-42x
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