Prove that: `tan^-1(1/4)+tan^-1(2/9)=1/2 cos^-1(3/5)`.

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Prove that: `tan^-1(1/4)+tan^-1(2/9)=1/2 0:05:32

Prove that: `tan^-1(1/4)+tan^-1(2/9)=1/2 cos^-1(3/5)`.

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Prove : tan⁻¹(1/4) + tan⁻¹(2/9) = 1/2 cos⁻¹( 3/5) = 1/2 sin⁻¹(4/5)

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`2 ( tan ^(-1)''(1)/(4) +tan ^(-1)''(2)/(9))=cos ^(-1)''(3)/(5)`

Prove that `2(tan^(-1)1/4+tan^(-1)2/9)=tan^(-1)4/3`. 0:03:44

Prove that `2(tan^(-1)1/4+tan^(-1)2/9)=tan^(-1)4/3`.

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