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Question

limx0sin(3+x)sin(3x)x

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Solution

limx0sin(3+x)sin(3x)x

=limx02cos(3+x+3x2)sin(3+x3+x2)x

=2limx0cos3.sinxx=2cos3limx0sinxx

=2 cos 3×1=2 cos 3


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