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Value of the expression 2[sin^(8)[(pi)/(...

Value of the expression `2[sin^(8)[(pi)/(16)]+sin^(8)[(3 pi)/(16)]+sin^(8)[(5 pi)/(16)] + sin^(8)[(7 pi)/(16)]]`

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(cos^(2)pi)/(8)+(sin^(2)(3 pi))/(8)+(sin^(2)(5 pi))/(8_(sin)^(2))(7 pi)/(8)=2

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The value of sin ((pi) / (14)) sin ((3 pi) / (14)) sin ((8 pi) / (14)) =