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Which of the following equations have no...

Which of the following equations have no real solutions ?

A

`.^(2) - 2x+ 5 + pi^(2) = 0`

B

`log_(1,5)(cot^(-1)x-sgn(e^(x))) = 2`

C

`x^(4) - 2x^(2)sin^(2)'(pix)/(2)+1 = 0`

D

all of these

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The correct Answer is:
A
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