Find $h_{m y}(x, y, z)$ for the function $h ( x , y , z ) = e ^ { 9 x } \cos ( y + 7 z )$
A) $63 e ^ { 9 x } \cos ( y + 7 z )$
B) $49 e ^ { 9 x } \sin ( y + 7 z )$
C) $- 63 e ^ { 9 x } \sin ( y + 7 z )$
D) $- 49 e ^ { 9 x } \cos ( y + 7 z )$

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The Answer of Find $h_{m y}(x, y, z)$ for the function $h ( x , y , z ) = e ^ { 9 x } \cos ( y + 7 z )$
A) $63 e ^ { 9 x } \cos ( y + 7 z )$
B) $49 e ^ { 9 x } \sin ( y + 7 z )$
C) $- 63 e ^ { 9 x } \sin ( y + 7 z )$
D) $- 49 e ^ { 9 x } \cos ( y + 7 z )$

Find hmy(x,y,z)h_{m y}(x, y, z)hmy​(x,y,z) For the Function h(x,y,z)=e9xcos⁡(y+7z)h ( x , y , z ) = e ^ { 9 x } \cos ( y + 7 z )h(x,y,z)=e9xcos(y+7z)

Find $h_{m y}(x, y, z)$ For the Function $h ( x , y , z ) = e ^ { 9 x } \cos ( y + 7 z )$