f(x)=cos(x-π/16) find derivative

1.	f(x)=cos(x-π/16) find derivative
Answer» f\'(x)=d/dx[cos(x-pi/16)]=-sin(x-pi/16){d/dx(x-pi/16)}=-sin(x-pi/16){1-0}=-sin(x-pi/16).......ANS

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