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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