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Practise using vector components when adding, subtracting or calculating the magnitude of vectors ahead of your National 5 Maths exam.
Revise using vector components to add and subtract vectors and work with position vectors as part of National 5 Maths.
R. Cushman, Examples of Nonintegrable Analytic Hamiltonian Vector Fields with no Small Divisors, Transactions of the American Mathematical Society, Vol. 238 (Apr., 1978), pp. 45-55 ...