dsyr2k(uplo, trans, n, k, alpha, a, lda, b, ldb, beta, c, ldc): void
perform a rank-2k matrix-matrix operation for a symmetric matrix C using general matrices A and B defined as
C := alpha * A * B' + alpha * B * A' + beta * C
or
C := alpha * A' * B + alpha * B' * A + beta * C
where C is a symmetric matrix
perform a rank-2k matrix-matrix operation for a symmetric matrix C using general matrices A and B defined as C := alpha * A * B' + alpha * B * A' + beta * C or C := alpha * A' * B + alpha * B' * A + beta * C where C is a symmetric matrix