9. Use the method of undetermined coefficients to solve the given system 4t +9er X' = -4 X + %3D

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Q: 4. How many fixed points does the function T(x) tan(x) have? %3D

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Q: 1. Give examples of subspaces of I and 12 which are not closed.

A: Given: Let us show the examples of subspaces of l∞ and l2 are not closed.