所屬科目：研究所、轉學考(插大)-微積分
(1)∫o π/2x sin xdx,
(2)sin2 xdx,
(3)，where R is the triangle with vertices (1,0), (4,0), x-y and (4,3).
(1)
(2)
3. (12%) Show that any function of the form z = f(x + at) + g(x - at) is a solution of the wave equation
5.(12%) Show that
(1) Find the equation of the tangent plane of the surface S at the point (1+π,1,1).
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sin2 xdx,
，where R is the triangle with vertices (1,0), (4,0), x-y and (4,3). 
