Find the best quadratic and cubic approximations for sin t for the L2 norm on [0, ]

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Find the best quadratic and cubic approximations for sin t for the L2 norm on [0, π] by using an orthogonal basis. Graph your results and estimate the maximal error.
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Applied Linear Algebra

ISBN: 978-0131473829

1st edition

Authors: Peter J. Olver, Cheri Shakiban

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