Question 84
Evaluate
$$
sin \left(1998^{\circ}+237^{\circ}\right) \sin \left(1998^{\circ}-1653^{\circ}\right)
$$
$$
sin \left(1998^{\circ}+237^{\circ}\right) \sin \left(1998^{\circ}-1653^{\circ}\right)
$$
MathNet 1998 — Part 01 Question 84
Math Olympiad Vault · MathNet 1998 — Part 01