# Mark Willis

• ### Multiplication and division of complex numbers in modulus-argument form.

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Mark Willis

• ### Negative numbers subtraction and division

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Mark Willis

• ### Solution of a 1st order differential equation with slope field.

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Mark Willis

• ### GeoGebra Apps for A-Level Pure Mathematics

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Mark Willis

• ### Finding the roots of a cubic using the factor theorem

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Mark Willis

• ### GeoGebra Apps for A-Level Further Pure Mathematics

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Mark Willis

• ### Fourier series for a periodic function 01

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Mark Willis

• ### Fourier series for a piecewise periodic function 01

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Mark Willis

• ### Fourier series for a piecewise periodic function 05

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Mark Willis

• ### Fourier series for a periodic function 04

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Mark Willis

• ### Fourier series for a piecewise periodic function 04

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Mark Willis

• ### Fourier series for a piecewise periodic function 03

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Mark Willis

• ### Fourier series for a periodic function 03

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Mark Willis

• ### Fourier series for a periodic function 02

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Mark Willis

• ### GeoGebra Apps for A-Level Mechanics including FM

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Mark Willis

• ### Fourier series for a piecewise periodic function 02

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Mark Willis

• ### Non-homogeneous 2nd order differential equations

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Mark Willis

• ### Solving 2nd-order differential equations using Laplace with graph

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Mark Willis

• ### Solving a 2nd-order differential equation using Laplace transformations

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Mark Willis

• ### Numerical solution of a second-order differential equation

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Mark Willis

• ### Numerical solution of a third-order differential equation 02

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Mark Willis

• ### Numerical solution of a third-order differential equation 01

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Mark Willis

• ### The steady state response of a damped second-order system

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Mark Willis

• Activity

Mark Willis