The value of $(1 - c o s A) (1 + c o s A) (c o s e c^{2} A)$ is:

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Solution

The correct option is B 1
$(1 - c o s A) (1 + c o s A) (c o s e c^{2} A)$
$= (1 - c o s^{2} A) (c o s e c^{2} A)$
$= s i n^{2} A \times c o s e c^{2} A$
$= s i n^{2} A \times \frac{1}{s i n^{2} A}$
$= 1$

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