Explain the difference between the OpenGL functions glFrustum ( ) and gluPerspective ( ).

The OpenGL functions `glFrustum()` and `gluPerspective()` are both used to define the projection matrix in 3D graphics, but they differ in their implementation and flexibility.

1. glFrustum(): This function is more flexible and general. It defines a perspective projection matrix by specifying six parameters: the left, __________ _______ ___ ____ __________ ________ _________ ____ _________ ________ ________.
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