Solved

In the Previous Three Problems, the Solution of the Original u(x,t)=∑n=1∞cnsin⁡(nπx/L)e−(nπ/L)tu ( x , t ) = \sum _ { n = 1 } ^ { \infty } c _ { n } \sin ( n \pi x / L ) e ^ { - ( n \pi / L ) t }

Question 13

Multiple Choice

In the previous three problems, the solution of the original problem is


A) u(x,t) =∑n=1∞cnsin⁡(nπx/L) e−(nπ/L) tu ( x , t ) = \sum _ { n = 1 } ^ { \infty } c _ { n } \sin ( n \pi x / L ) e ^ { - ( n \pi / L ) t } , where cn=∫0Lf(x) cos⁡(nπx/L) dxc _ { n } = \int _ { 0 } ^ { L } f ( x ) \cos ( n \pi x / L ) d x
B) u(x,t) =∑n=0∞cncos⁡(nπx/L) cos⁡(nπt/L) u ( x , t ) = \sum _ { n = 0 } ^ { \infty } c _ { n } \cos ( n \pi x / L ) \cos ( n \pi t /L ) , where c0=∫0Lf(x) dx/L,cn=2∫0Lf(x) cos⁡(nπx/L) dx/Lc _ { 0 } = \int _ { 0 } ^ { L } f ( x ) d x / L , c _ { n } = 2 \int _ { 0 } ^ { L } f ( x ) \cos ( n \pi x / L ) d x / L
C) u(x,t) =∑n=1∞cnsin⁡(nπx/L) sin⁡(nπt/L) u ( x , t ) = \sum _ { n = 1 } ^ { \infty } c _ { n } \sin ( n \pi x / L ) \sin ( n \pi t / L ) , where cn=2∫0Lf(x) cos⁡(nπx/L) dx/Lc _ { n } = 2 \int _ { 0 } ^ { L } f ( x ) \cos ( n \pi x / L ) d x / L
D) u(x,t) =∑n=1∞cnsin⁡(nπx/L) e−nxt/Lu ( x , t ) = \sum _ { n = 1 } ^ { \infty } c _ { n } \sin ( n \pi x / L ) e ^ { - nxt / L } , where cn=2∫0Lf(x) sin⁡(nπx/L) dx/Lc _ { n } = 2 \int _ { 0 } ^ { L } f ( x ) \sin ( n \pi x / L ) d x / L
E) u(x,t) =∑n=0∞cncos⁡(nπx/L) e−nxt/Lu ( x , t ) = \sum _ { n = 0 } ^ { \infty } c _ { n } \cos ( n \pi x / L ) e ^ { - n x t / L } , where cn=∫0Lf(x) cos⁡(nπx/L) dxc _ { n } = \int _ { 0 } ^ { L } f ( x ) \cos ( n \pi x / L ) d x

Correct Answer:

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