TAN 120 = ?

Geometry Level 1

Find the value of Tan 120* if A = 30* and B =90*.

T a n A + T a n B 1 − ( T a n A ∗ T a n B ) \frac{Tan A + Tan B}{1 - (Tan A * Tan B)}

Details and Assumptions :

All the numbers followed by asterisk ( * ) are in degrees.

The answer must be in the form of decimal.

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The answer is -1.73205.

Anubhav Sharma by Anubhav Sharma , 20, USA

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2 solutions

Anubhav Sharma
May 27, 2015

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tan120deg = tan(60+60). But in this question, it is just a trick to assume tan120deg = tan(30+90) since tan 90 =complex infinity. Thus, tan(120)= -sqrt(3)=-1.732.....

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