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Question

limh0(a+h)2sin(a+h)a2sinah=

A
a2cosa2acos
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B
a2cosa+2asina
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C
a2sin
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D
acosasina
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Solution

The correct option is D a2cosa+2asina
limh0(a+h)2sin(a+h)a2sinah

f(x)=x2sinx
f(a)=limxaf(x)f(a)xa

limh0f(a+h)f(a)h,xa=h

f(a)=(a+h)2sin(a+h)a2sinah
f(x)=2xsinx+x2cosx
f(a)=2asina+a2cosa

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