Find the Derivative $$r = 20 - \theta ^ { 4 } \cos \theta$$

question 374

Multiple Choice

Find the derivative.
- $$r = 20 - \theta ^ { 4 } \cos \theta$$

• A) \(\frac { \mathrm { dr } } { \mathrm { d } \theta } = 4 \theta ^ { 3 } \sin \theta - \theta ^ { 4 } \cos \theta\)
• B) \(\frac { \mathrm { dr } } { \mathrm { d } \theta } = 4 \theta ^ { 3 } \sin \theta\)
• C) \(\frac { \mathrm { dr } } { \mathrm { d } \theta } = 4 \theta ^ { 3 } \cos \theta - \theta ^ { 4 } \sin \theta\)
• D) \(\frac { \mathrm { dr } } { \mathrm { d } \theta } = - 4 \theta ^ { 3 } \cos \theta + \theta ^ { 4 } \sin \theta\)

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