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[" If "cos^(-1)x-cos^(-1)((y)/(2))=alpha...

[" If "cos^(-1)x-cos^(-1)((y)/(2))=alpha],[4x^(2)-4xy cos alpha+y^(2)=.........]

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If cos^(-1)x-cos^(-1)((y)/(2))=alpha then 4x^(2)-4xy cos alpha+y^(2)=

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