Trigonometry Examples

$\arccos (\cos (- \frac{3 π}{5}))$

Step 1

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

$\arccos (\cos (\frac{7 π}{5}))$

Step 2

The result can be shown in multiple forms.

Exact Form:

$\arccos (\cos (\frac{7 π}{5}))$

Decimal Form:

$1.88495559 \dots$