Precalculus Examples

$\frac{\tan (\frac{π}{7}) + \tan (\frac{4 π}{21})}{1 - \tan (\frac{π}{7}) \tan (\frac{4 π}{21})}$

Step 1

The result can be shown in multiple forms.

Exact Form:

$\frac{\tan (\frac{π}{7}) + \tan (\frac{4 π}{21})}{1 - \tan (\frac{π}{7}) \tan (\frac{4 π}{21})}$

Decimal Form:

$1.73205080 \dots$