Mathematics

Problem

To find the exact value of

\sin 105^{\circ}

using two standard angles with known exact trigonometric values, 105° should be expressed as a)

90^{\circ} + 15^{\circ}

60^{\circ} + 45^{\circ}

60^{\circ} - 45^{\circ}

60^{\circ} + 30^{\circ}