using multiplication facts is that You just memorize the multiplications so, 6 x 9 = 54
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-2 x 3
3 is 1 third of nine. so for 1x9 just do 1x3 and times the answer by 3. 1x3=3 and 3x3=9 so 1x9=9. 2x3=6 and 6x3=18 so 9x2=18 and so on and so on.
(72 x 1) (36 x 2) (24 x 3) (18 x 4) (12 x 6) (9 x 8)
(6 Cosx)2
1 x 36, 2 x 18, 3 x 12, 4 x 9, 6 x 6.