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If sin^(2)A=x and underset(r=1)overset(4...

If `sin^(2)A=x` and `underset(r=1)overset(4)Pi sin (r A)=ax^(2)+bx^(3)+cx^(4)+dx^(5)`, then the value of `10a-7b+15c-5d` must be

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