In the Previous Two Problems, the Product Solutions Are
A) $\sin ( n \pi x / L ) \sinh ( n \pi ( y - H ) / L )$

Multiple Choice

In the previous two problems, the product solutions are

A) $\sin ( n \pi x / L ) \sinh ( n \pi ( y - H ) / L )$
B) $\cos ( n \pi x / L ) \sinh ( - n \pi ( y - H ) / L )$
C) $\cos ( n \pi x / L ) \cosh \left( ( n \pi / L ) ^ { 2 } ( y - H ) \right)$
D) $\sin ( n \pi x / L ) \cosh \left( - ( n \pi / L ) ^ { 2 } ( y - H ) \right)$
E) $\cos ( n \pi x / L ) \cosh ( - n \pi ( y - H ) / L )$