Simplified form of \[\left( \mathbf{1 + co}{{\mathbf{t}}^{\mathbf{2}}}\theta \right)\mathbf{ }\left( \mathbf{1 - cos }\theta \right)\mathbf{ }\left( \mathbf{1 + cos }\theta \right)\]is ______

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1.	Simplified form of \[\left( \mathbf{1 + co}{{\mathbf{t}}^{\mathbf{2}}}\theta \right)\mathbf{ }\left( \mathbf{1 - cos }\theta \right)\mathbf{ }\left( \mathbf{1 + cos }\theta \right)\]is ______
A.	1
B.	0
C.	\[Cosec\text{ }\theta ~~~~~\]
D.	\[Sin\text{ }\theta ~~~~~~~~\]
E.	None of these
Answer» B. 0

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Simplified form of \[\left( \mathbf{1 + co}{{\mathbf{t}}^{\mathbf{2}}}\theta \right)\mathbf{ }\left( \mathbf{1 - cos }\theta \right)\mathbf{ }\left( \mathbf{1 + cos }\theta \right)\]is ______

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