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alpha = sin 36^@ is root of which of the...

`alpha = sin 36^@` is root of which of the following equation

A

`16x^4-20x^2+5=0`

B

`x^4+16x^2+5=0`

C

`x^4-20x^2+5=0`

D

`x^4+20x^2-5=0`

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