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Verify That Each Equation Is an Identity $\cot x \sec ^ { 4 } x = \cot x + 2 \tan x + \tan ^ { 3 } x$

Question 131

Essay

Verify that each equation is an identity.
- $\cot x \sec ^ { 4 } x = \cot x + 2 \tan x + \tan ^ { 3 } x$

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