RahulZ
prove that tan1 1/8 + tan1 1/5 = tan1 1/3



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JMonstur
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tan1 (1/8) = 7.12
tan1 (1/5)= 11.31
tan1 (1/3) = 18.43
tan1 (1/8) + tan1 (1/5) = tan1 (1/3)
7.12 + 11.31 = 18.43

shd101wyy
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use the caculator??????

JMonstur
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^ His idea, exactly.

Ishaan94
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\[tan^{1}A + tan^{1}B = tan^{1}{\frac{A + B}{1 AB}}\]

Ishaan94
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\[tan^{1} {\frac{\frac{1}{8} + \frac{1}{5}}{{1}  {\frac{1}{40}}}}\]

Ishaan94
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\[tan^{1}{\frac{13}{39}} = tan^{1}{\frac{1}{3}}\]

Ishaan94
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\[\text{^_^ That is your solution :D} \]

xChessMachinex
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Nice job.