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ind the value o 1. xcube-8ycube-36xy-216 when x=2y+6

x3-8y3-36xy-216=(2y+6)3-8y3-216-36(2y+6)y
                        =8y3+72y2+216y+216-8y3-216-72y2+216y
=432y
                             


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