Question

evaluate cos 1 cos 2 cos 3 cos 4 dash cos 178 cos 179 cos 180

Answer 1

Correct Question

→ Evaluate cos1° cos2° cos3° ....... cos178° cos 179° cos180°

Solution

To Find: cos1° cos2° cos3° ....... cos178° cos 179° cos180°.

We know that in this series, one of the value will be cos90°.

→cos1° cos2° cos3° .... cos89° cos90° cos 91°.... cos178° cos 179° cos180°

Since cos90° = 0,

→ cos1° cos2° cos3° .... cos89° × 0 × cos 91°.... cos178° cos 179° cos180°

→ 0

Answer

→ 0