Find the partial derivative of x 1

X2 should be regarded as a constant,

At this point, Tu is only a unary function of x 1

Tu=3x2？ x 1

∴Mu 1=3x2？

When looking for Mu2,

Find the partial derivative of x2,

X 1 should be regarded as a constant,

At this point, Tu is only a unary function of x2.

Tu=3x 1 x2？

∴Mu2=3x 1 2x2=6x 1 x2