JenniferSmart1
\[tan^{1}(tan\frac{4*\pi}{5})=\]



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JenniferSmart1
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I get \[\frac\pi{5}\]

JenniferSmart1
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what did I do wrong?

hartnn
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its pi/5 , right ?
\(\tan (\theta  \pi)=\tan \theta\)
4pi/5  pi = pi/5
also, \(\tan^{1}\tan \theta = \theta \)

JenniferSmart1
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oh it's period is pi.....I see

hartnn
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yes, period of tan theta = pi. thats why its has same values after every 180 degrees...

JenniferSmart1
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makes sense. Thanks!

hartnn
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welcome :)