Find the Differential $d y \text { of the function } y = x \cos ( 7 x ) \text {. }$

question 56

Multiple Choice

Find the differential $d y \text { of the function } y = x \cos ( 7 x ) \text {. }$

• A) \(7 x \sin ( 7 x ) d x\)
• B) \(\cos ( 7 x ) d x\)
• C) \(\cos ( 7 x ) + 7 x \sin ( 7 x ) d x\)
• D) \(\cos ( 7 x ) - 7 x \sin ( 7 x ) d x\)
• E) \(- 7 x \sin ( 7 x ) d x\)

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