Question: Let y = c o s ( 7 x 2 1 ) Find the differential, d y . d y = s i n (

Let y=cos(7x21)
Find the differential, dy.
dy=sin(7x21)dx
dy=14xsin(7x21)dx
dy=-sin(7x21)dx
dy=-14xsin(7x21)dx
Let y = c o s ( 7 x 2 1 ) Find the differential,

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