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lim-(xrarrpi/4)(cot^3x-tanx)/(cos(x+pi/4...

`lim-(xrarrpi/4)(cot^3x-tanx)/(cos(x+pi/4))` is equal to (A) `8` (B) `4sqrt2` (C) `8sqrt2` (D) `2sqrt2`

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The correct Answer is:
8
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