Trigonometry Examples

$\cot (\frac{- π}{5}) \tan (\frac{11 π}{5})$

Step 1

Move the negative in front of the fraction.

$\cot (- \frac{π}{5}) \tan (\frac{11 π}{5})$

Step 2

Add full rotations of $2 π$ until the angle is greater than or equal to $0$ and less than $2 π$ .

$\cot (\frac{9 π}{5}) \tan (\frac{11 π}{5})$

Step 3

Subtract full rotations of $2 π$ until the angle is greater than or equal to $0$ and less than $2 π$ .

$\cot (\frac{9 π}{5}) \tan (\frac{π}{5})$

Step 4

The result can be shown in multiple forms.

Exact Form:

$\cot (\frac{9 π}{5}) \tan (\frac{π}{5})$

Decimal Form:

$- 1.000000000000 \dots$