Let $f ( \theta , \phi ) = \sin ^ { 2 } 2 \theta \cos ^ { 3 } 2 \varphi$

Short Answer

Let $f ( \theta , \phi ) = \sin ^ { 2 } 2 \theta \cos ^ { 3 } 2 \varphi$ .Find $\left. \frac { \partial f } { \partial \theta } \right| _ { ( \theta = \pi / 6 , \varphi = \pi / 8 ) }$ to 3 decimal places.