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$$ {a^2-b^2-2bc-c^2}\over{a^2+b^2+2ab-c^2}$$ is equal to
5Q:
$$ {a^2-b^2-2bc-c^2}\over{a^2+b^2+2ab-c^2}$$ is equal to
- 1$$ {a-b-c}\over{a+b-c}$$true
- 2$$ {a-b+c}\over{a+b-c}$$false
- 3$$ {a-b-c}\over{a+b+c}$$false
- 4$$ {a-b-c}\over{a+b-c}$$false
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