This requires:

1) Find the integral

2) Substitute 1.6 into the integral

3) Substitute 1.2 into the integral

4) Subtract.

`int_1.2^1.6(5+6/x^4)dx=int_1.2^1.6(5+6x^-4)dx`

`=[5x-2x^-3]_1.2^1.6`

`=7.5117-4.8426`

`=2.6691`

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