Determine the projection f(x) = 1 along sin(x), sin(3x)and find from there a function of the form 1 + c1 sin(x) + c3 sin(3x), which is perpendicular to both sin(x) and sin(3x). Explain why this combination is perpendicular to all functions in (8.1) for k = 5.
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- On the set of continuous functions in the range [−1,1] Which two functions below are perpendicular to each other according to the inner product defined as ⟨f,g⟩=∫1−1f(x)g(x)dx?Consider the Cauchy Problem y 0 = a(x) arctan y, y(0) = 1, where a(x) is a continuous function defined on R, such that for every x it holds that |a(x)| ≤ 1. Using the Global Picard–Lindel¨of Theorem, show that there exists a unique solution y defined on R.Find the Wronskian for the set of functions.{x, ex, sin x, cos x}
- Find the Wronskian for the set of functions.{1, x, cos x, e−x}Find the Wronskian for the set of functions.{x, sin x, cos x}Suppose that the second order partial derivatives, fx,y and fy,x, are both continuous on an open set V in R2. Use Fubini’s theorem to prove that fx,y = fy,x in V . Hint: if fx,y(a) − fy,x(a) > 0, there is a rectangle R containing a on which fx,y − fy,x > 0.
- If f : [0,2] → R is defined by f(x) = 1 if 0 ≤ x ≤ 1, f(x) = 2 if 1 < x ≤ 2. Show that f is integrable and find R2 0 f(x)dxVerify the divergence theorem for F=3i + xy j + x k taken over the region bounded by z = 4 - y^2 , x = 0 , x = 3 , and the xy-plane.Let f(x) = 21 - x2 and g(x) = x2 + 3. Use symmetry, if appropriate, to help find the center of gravity, ( x, y ), of the bounded region enclosed by the graphs of f and g.
- Let f(x) = 2x - 1 and g(x) = x - 3 on [ 3 , 6 ]. Find the center of gravity of the region between the graphs of f and g.Show that the Dirichlet function f defined on [0 , 1] by f(x) = {1 if x is rational0 if x is irrationalis not Riemann integrable on [0 , 1]Consider the following theorem. Theorem If f is integrable on [a, b], then b a f(x) dx = lim n→∞ n i = 1 f(xi)Δx where Δx = b − a n and xi = a + iΔx. Use the given theorem to evaluate the definite integral. 7 (x2 − 4x + 7) dx 1