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If P=a^2-b^2+2a b ,\ Q=a^2+4b^2-6a b\ , ...

If `P=a^2-b^2+2a b ,\ Q=a^2+4b^2-6a b\ ,` `R=b^2+b ,\ S=a^2-4a b` and `T=-2a^2+b^2-a b+adot`
Find `P+Q+R+S-Tdot`

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