How do you factor trigonometric expressions

[From: ] [author: ] [Date: 11-05-04] [Hit: ]

How do you factor the expression

cot^4x + 3 cot^2x +2 ?

=(cot^2 x + 1)(cot^2 x + 2) = csc^2 x ( csc^2 x + 1)

thnx for all

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