QuestionFind two positive and two negative angles coterminal with the angle $A=90^{\circ}$.

Studdy Solution
Calculate the second negative coterminal angle.
$$A_{coterminal}^{-} =90^{\circ} +360^{\circ} \times -2 = -630^{\circ}$$The next two positive coterminal angles are $450^{\circ}$ and $810^{\circ}$, and the next two negative coterminal angles are $-270^{\circ}$ and $-630^{\circ}$.