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The numerical value of tan^-1{2tan^-1(1/5) - π/4} is ?

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The numerical value of tan-1{2tan-1(1/5) - π/4} is ?

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Given, tan-1{2tan-1(1/5) - π/4}

tan-1{2tan-1(1/5) - π/4}

= tan(tan-1(-7/17))

= (-7/17)

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