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3.Trigonometrical Ratios, Functions and Identities
easy
$\cos 1^\circ .\cos 2^\circ .\cos 3^\circ .........\cos 179^\circ = $
A
$0$
B
$1$
C
$2$
D
$\frac{1}{2}$
Solution
(a) We know that one of the factor of the given expression is $\cos 90^\circ = 0$.
Therefore $\cos 1^\circ .\cos 2^\circ .\cos 3^\circ …\cos 179^\circ = 0$.
Standard 11
Mathematics
