Q.
If m and x are two real numbers and i=-1 , then e2micot-1xxi+1xi-1m=
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a
2
b
0
c
1
d
3
answer is C.
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Detailed Solution
Let Cot-1x=θ, then x=cotθ∴e2m icot−1xxi+1xi−1m=e2m iθicotθ+1icotθ−1m =e2m iθicotθ−iicotθ+im =e2m iθcosθ−isinθcosθ+isinθm =e2m iθe−iθeiθm =e2mi θe−2iθm =1
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