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[" If "cos^(-1)(n)/(a)+cos^(-1)(y)/(b)=a...

[" If "cos^(-1)(n)/(a)+cos^(-1)(y)/(b)=a," then "(n^(2))/(a^(2))(-2xy)/(ab)log_(b^(2))(y^(2))/(b^(2))],[" is equal to "]

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