It is simply: yx which in algebra means y times x
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9 x 6 = 5454 x 4 = 216
1 x 57, 3 x 19.
225
7 multiplyed by 4 equals 28
y = sin(x+y) cos( x + y )[(1 + y')] = y' cos(x + y ) + y'cos(x + y ) = y' y'-y'cos( x+ y) = cos( x + y ) y'[1-cos(x+y)]= cos(x+y) y'= [cos(x+y)]/ [1-cos(x+y)]