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3.3.1 Line and plane in space
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10.3.1 Operations with complex numbers
11.5.3.2 With variable coefficients
12.2.8 Number theory
8.1.3.13 Higher order differential equations
8.3.13 Systems of ordinary differential equations
16.9 Topology
17.1 USE problems
17.2 USE problems
17.4 USE problems
17.5 USE problems
17.6 USE problems
17.8 USE problems
17.11 USE problems
17.12 USE problems
