The triangular solve with multiple right-hand-sides operation updates 
matrix B according
to one of the following
formulae:
Here
L and 
indicate
the lower- and strictly lower triangular part of matrix A ,
respectively, and
U and 
indicate
the upper- and strictly upper triangular part of matrix A , respectively.
Which of these formulae is used is determined by parameters
SIDE, UPLO, TRANS, and UNIT.