Posted by **Angela** on Wednesday, October 7, 2009 at 10:31pm.

I am trying to find the inverse of matrix A but I don't know how to do it with sin and cos. Please help.

A=6e3tsin(6t) −6e4tcos(6t)

−5e3tcos(6t) −5e4tsin(6t)

then A−1=

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