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The value of $\cos 1^{\large\circ}\cos 2^{\large\circ}\cos 3^{\large\circ}.......\cos 179^{\large\circ}$ is

$\begin{array}{1 1}(A)\;\large\frac{1}{\sqrt 2}&(B)\;0\\(C)\;1&(D)\;-1\end{array} $

1 Answer

$\cos 1^{\large\circ}\cos 2^{\large\circ}\cos 3^{\large\circ}$.......$\cos 90^{\large\circ}$.......$\cos 91^{\large\circ}$........$\cos 179^{\large\circ}$
$\therefore \cos 90^{\large\circ}=0$
So the product is 0
Hence (B) is the correct answer.
answered Apr 21, 2014 by sreemathi.v
 

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