Evaluate tan(-pi/8)

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Trigonometry

Evaluate tan(-pi/8)

$\tan (- \frac{π}{8})$

Add full rotations of $2 π$ until the angle is between $0$ and $2 π$ .

$\tan (\frac{15 π}{8})$

Evaluate $\tan (\frac{15 π}{8})$ .

$- 0.41421356$

The result can be shown in multiple forms.

Exact Form:

$\tan (- \frac{π}{8})$

Decimal Form:

$- 0.41421356 \dots$

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