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[" (1) "cos^(-1)(x)/(a)+cos x(-y)/(b)=(2...

[" (1) "cos^(-1)(x)/(a)+cos x(-y)/(b)=(2x)/(a^(2))+(x^(2))/(a^(2))+(y^(2))/(b^(2))(2^(x)y^(2))/(ab^(6)+c^(2))=sin^(2)alpha],[" prove thin "(x^(2))/(a^(2))" and "]

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