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Prove that the value of each the followi...

Prove that the value of each the following determinants is zero:
`|sin^2(x+(3pi)/2)sin^2(x+(5pi)/2)sin^2(x+(7pi)/2)|`
`|sin^.(x+(3pi)/2)sin^.(x+(5pi)/2)sin^.(x+(7pi)/2) |`
`|sin^.(x-(3pi)/2)sin^.(x-(5pi)/2)sin^.(x-(7pi)/2)|`

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