Find the Derivative of the Function $u ( x ) = \sec \left( x ^ { 5.2 } + 2.8 x - 9 \right)$

Find the derivative of the function. $u ( x ) = \sec \left( x ^ { 5.2 } + 2.8 x - 9 \right)$

A) $u ^ { \prime } ( x ) = \left( 5.2 x ^ { 4.2 } + 2.8 \right) \sec \left( x ^ { 5.2 } - 2.8 x - 9 \right) \tan \left( x ^ { 5.2 } - 2.8 x - 9 \right)$
B) $u ^ { \prime } ( x ) = \left( 5.2 x ^ { 4.2 } - 2.8 \right) \sec \left( x ^ { 5.2 } + 2.8 x - 9 \right) \tan \left( x ^ { 5.2 } + 2.8 x - 9 \right)$
C) $u ^ { \prime } ( x ) = \left( 5.2 x ^ { 4.2 } - 2.8 \right) \sec \left( x ^ { 5.2 } - 2.8 x - 9 \right) \tan \left( x ^ { 5.2 } + 2.8 x - 9 \right)$
D) $u ^ { \prime } ( x ) = \left( 5.2 x ^ { 4.2 } + 2.8 \right) \sec \left( x ^ { 5.2 } + 2.8 x - 9 \right) \tan \left( x ^ { 5.2 } + 2.8 x - 9 \right)$
E) $u ^ { \prime } ( x ) = \left( 5.2 x ^ { 4.2 } - 2.8 \right) \sec \left( x ^ { 5.2 } - 2.8 x - 9 \right) \tan \left( x ^ { 5.2 } - 2.8 x - 9 \right)$

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