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Find the value of sin^(2)""(pi)/(10)+sin...

Find the value of `sin^(2)""(pi)/(10)+sin^(2)""(4pi)/(10)+sin^(2)""(6pi)/10+sin^(2)""(9pi)/10`.

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The correct Answer is:
`=2(sin^(2).(pi)/(10)+cos^(2).(pi)/(10))=2(1)=2`
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