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[" Friti "/ABC" it fers "7" fif "],[qqua...

[" Friti "/_ABC" it fers "7" fif "],[qquad [ln Delta ABC" Prove that ",(cos2A)/(a^(2))-(cos2B)/(b^(2))-(1)/(a^(2))-(1)/(b^(2))],[(cos2A')/(a^(2))-(cos2B)/(b^(2))=(1)/(2^(2))-(1)/(b^(2))]]

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