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[" 5.If "3x=sec theta" and "(3)/(x)=tan ...

[" 5.If "3x=sec theta" and "(3)/(x)=tan theta" ,then find the value of "9(x^(2)-(1)/(x^(2)))],[" 6.Show that "cos theta((1)/(1)-(1)/(1))" can be written in the form "k" tan "A" and "f" ."]

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