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Pattern Recognition

The Three Domain Rules

99% of CSCA domain questions turn on one of three forbidden operations.

Domain={x∈R:f(x) is defined}

Always check these three before answering any domain question

÷0

Denominator =0

For x−31​, need x=3

neg​

Inside ≥0

For x−4​, need x≥4

log(≤0)

Input >0 (strict)

For log(x+1), need x>−1