26. Find the harmonic function which vanishes on the hypotenuse and has prescribed values on the other two sides of an isosceles right-angled triangle formed by x = 0, y= 0, and y = a – x, where a is...

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Extracted text: 26. Find the harmonic function which vanishes on the hypotenuse and has prescribed values on the other two sides of an isosceles right-angled triangle formed by x = 0, y= 0, and y = a – x, where a is a constant.