Find dy/dt.
-$$y = \cos ( \sqrt { 6 t + 12 } )$$
A) $- \frac { 1 } { 2 \sqrt { 6 t + 12 } } \sin ( \sqrt { 6 t + 12 } )$
B) $- \sin \left( \frac { 3 } { \sqrt { 6 t + 12 } } \right)$
C) $- \sin ( \sqrt { 6 t + 12 } )$
D) $\frac { 3 } { \sqrt { 6 t + 12 } } \sin ( \sqrt { 6 t + 12 } )$

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The Answer of Find dy/dt.
-$$y = \cos ( \sqrt { 6 t + 12 } )$$
A) $- \frac { 1 } { 2 \sqrt { 6 t + 12 } } \sin ( \sqrt { 6 t + 12 } )$
B) $- \sin \left( \frac { 3 } { \sqrt { 6 t + 12 } } \right)$
C) $- \sin ( \sqrt { 6 t + 12 } )$
D) $\frac { 3 } { \sqrt { 6 t + 12 } } \sin ( \sqrt { 6 t + 12 } )$

Find Dy/dt y=cos⁡(6t+12)y = \cos ( \sqrt { 6 t + 12 } )y=cos(6t+12​)

Find Dy/dt $y = \cos ( \sqrt { 6 t + 12 } )$