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Prove the following: 4tan^(-1)1/5-tan^(...

Prove the following: `4tan^(-1)1/5-tan^(-1)1/(70)+tan^(-1)1/(99)=pi/4` `2t a n^(-1)1/5+s e c^(-1)(5sqrt(2))/7+2tan^(-1)1/8=pi/4`

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