Invert this matrix.
<p>
If <code>this</code> matrix represents an {@link #isAffine() affine} transformation, such as translation, rotation, scaling and shearing,
and thus its last row is equal to <code>(0, 0, 0, 1)</code>, then {@link #invertAffine()} can be used instead of this method.
Invert this matrix. <p> If <code>this</code> matrix represents an {@link #isAffine() affine} transformation, such as translation, rotation, scaling and shearing, and thus its last row is equal to <code>(0, 0, 0, 1)</code>, then {@link #invertAffine()} can be used instead of this method.
@see #invertAffine()
@return this