Question

The value of \(\cos 1^\circ \cos 2^\circ \cos 3^\circ s \cos 180^\circ\) is:

• A. \(\frac1\sqrt2\)
• B. 0
• C. 1
• D. -1

Hint:

In product sequences, always check if any term is zero — it instantly determines the entire product.

Answer 1

The Correct Option is B

The product includes \(\cos 90^\circ\) as one of its terms.
Since \(\cos 90^\circ = 0\), multiplying any number by zero results in zero.
Thus, without computing the rest of the terms, we can conclude that the entire product is \(0\).
Therefore, the correct answer is (B) 0.