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Question

limx0sin(2+x)sin(2x)x

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Solution

limx0sin(2+x)sin(2x)x

=limx02cos(2+x+2x2)sin(2+x2+x2)x=2limx0cos(2)×sinxx

=2limx0cos2×limx0sinxx [limx0sinxx=1]

=2 cos 2×1=2 cos 2


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