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<p>and the <a href="page.php?w=Helmholtz_equation">Helmholtz equation</a>sthat arise in many physical problems. The angular portions of the solutions to such equations take the form of <a href="page.php?w=spherical_harmonics">spherical harmonics</a>. Another application is <a href="page.php?w=ergonomic_design">ergonomic design</a>, where  is the arm length of a stationary person and the angles describe the direction of the arm as it reaches out. The spherical coordinate system is also commonly used in 3D <a href="page.php?w=game_development">game development</a></p><p>
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