sin(3/2-5α)

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sin(3/2-5α)sin(3/2-5α)sin(3/2-5α)sin(3/2-5α)=-cos(-5α)=-cos(5α)

sin(3/2-5α)
sin(3/2-5α)

sin(3/2-5α)
sin(3/2-5α)=-cos(-5α)=-cos(5α)