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Question

limnsin(a2n)sin(b2n)

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Solution

=limnsin(a2n)sin(b2n)

=n, Let 1nh0

=limh0a21hlimh0b21h

=⎜ ⎜ ⎜ ⎜limh0sina21ha21h×a21h⎟ ⎟ ⎟ ⎟⎜ ⎜ ⎜ ⎜ ⎜limh0sinb21hb21h×b21h⎟ ⎟ ⎟ ⎟ ⎟

=1×a1×b=ab


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