4. Find the solution of the vibrating string problem ᎧᎳ ᎧᎳ + əx² dy² with the boundary conditions W (0, y) = W (1, y) = 0, ᎧᎳ 1 ㅠ = cos(- 2πx) - 3 sin(5x), ду W(x,0)= = 0, 0≤x≤1, 0≤ y ≤ 1, 3π -(x,0) = cos(- +3πx). 2 Trigonometric formula cos(A + B) = cos A cos B - sin A sin B.

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