Texture lookup with derivatives in Cg?

I work with Cg.
And I can’t found functions for texture lookup
with explicit gradients.

But there is TXD instruction in GL_NV_fragment_program specification
and ARB_shader_texture_lod in openGL ( Cg can generate code for that profiles ).

Those are on page 39 of the Cg User’s manual (v 1.4).
They are referred to as ‘with derivatives’.

Many thanks - that is it.

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