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Prove that 2"tan"^(-1)1/2+"tan"^(-1)1/7=...

Prove that `2"tan"^(-1)1/2+"tan"^(-1)1/7="tan"^(-1)31/17`

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Prove : 2"tan"^(-1)1/2+"tan"^(-1)1/7="tan"^(-1)31/17

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Prove that: 2tan^(-1)1/2+tan^(-1)1/7=tan^(-1)(31)/(17)

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Prove the following : 2"tan"^(-1)1/2+"tan"^(-1)1/7="tan"^(-1)31/17

Prove the following : 2"tan"^(-1)1/2+"tan"^(-1)1/7="tan"^(-1)31/17

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Prove that: 2tan^(-1) {1/2}+tan^(-1) {1/7}=tan^(-1) {(31)/(17)}