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[" Prove the following identities: "(58-...

[" Prove the following identities: "(58-75)],[" 58.If "x=a" sec "theta+b" tan "theta" and "y=a tan theta+b sec theta," provethat "x^(2)-y^(2)=a^(2)-b^(2)],[" [CBSE "2001,2002C" ] "]

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