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[Expand]multiplying a root by a root
no such category found: #R×R
[Expand]multiplying a root by a number
no such category found: #R×N
[Expand]multiplying a root by a root and a number
no such category found: #R×(R+N)
[Expand]multiplying a root by a number minus a root
no such category found: #R×(N-R)