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Spec: ERR2 · No calculator · ~180s
Letters only — the answer key is hidden. Work it out, then check the solution below.
No written hint yet — check the trope: trig-supplement-solutions, sin-equals-sin-periodicity. Name the trap first, work the stem by hand, then open the solution below.
Same topic · same level
TMUA-P2-ERR2-004
A student solves -2x > 6 by dividing both sides by -2 to get x > -3. What is the error?
Common fallacies
Same trap: trig-supplement-solutions
TMUA-P2-ERR2-017
A student solves 2θ=θ on [0,2π) by writing 2θ=θ, hence θ=0 only. What is wrong?
Common fallacies
Step up a level
TMUA-P2-ERR2-009
A sixth-former optimises a profit function P(x) and argues as follows: Fermat's theorem says that if P has a local maxim…
Common fallacies