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a
1. if n=m
b
0. if n>m
c
∞. if n
d
nm. if n
answer is A.
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Detailed Solution
L= limx→0 sinxnsinxm = limx→0 sinxnxnxnsinxmxmxm= limx→0 xn-m If n=m, then L = a very small value near to zeroexactly zero=1 If n>m, then L = a very small value near to zeropositive integer=0If n