prove that $(\tan ^{-1}(1)+\tan ^{-1}(2)+\tan ^{-1}(3)=\pi$

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written 4.7 years ago by

teamques10 ★ 65k

modified 2.1 years ago by

pedsangini276 • 4.8k

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1 Answer

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written 4.7 years ago by

teamques10 ★ 65k

Solution:

$\tan ^{-1}(1)+\tan ^{-1}(2)+\tan ^{-1}(3)$

$=\pi+\tan ^{-1}\left(\frac{1+2}{1-(1)(2)}\right)+\tan ^{-1}(3)$

$=\pi+\tan ^{-1}(-3)+\tan ^{-1}(3)$

$=\pi-\tan ^{-1}(3)+\tan ^{-1}(3)$

$=\pi$

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