Enter your working line by line. Learnex checks each step, flags the first wrong one and shows the fix, so you learn the rule, not just the answer.
Type or paste the problem, then write your solution one step per line. Use the symbol bar for powers, fractions, roots and integrals.
Learnex goes through your working line by line and tests whether each step follows from the one before it.
It flags the first faulty line, names the type of error and explains the rule that was missed.
See your line and the corrected line side by side, then redo the working from that point yourself.
Not just "wrong answer": the specific line where your working stops following from the last one.
Distributive property misses, sign flips, missed chain-rule factors and fraction-splitting errors, each explained in plain words.
Your line next to the corrected line, with the rule behind the correction.
Stuck before you start? Get guided through strategy, rule, substitution and a sanity check without being handed the final answer.
See what each symbol does and the geometric or physical picture behind a formula.
Calculus, linear algebra, physics-style mechanics and chemistry stoichiometry problems.
A student differentiates y = sin(3x²). Here is the working and what the lab reports.
Student working
Diagnosis
Corrected line
Key Takeaway
When you differentiate a function of a function, differentiate the outside, keep the inside, then multiply by the derivative of the inside.
Check each line against the one before it and stop at the first line that does not logically follow. That line contains the error. The Learnex Math Lab automates this: enter your working one step per line and it flags the first faulty line, names the error type and shows a corrected version side by side.
No. The Derivation Co-Pilot guides you through strategy, rule, substitution and a sanity check without handing over the final answer. The mistake finder shows the corrected line and the way forward from the point of error, so you can redo the rest yourself.
Common algebra and calculus slips, such as distributive property misses, sign flips, missed chain-rule factors and fraction-splitting errors. Each error is named and explained so you can spot the same trap next time.
A solver starts from the problem and shows its own solution. The mistake finder starts from your working and responds to what you actually wrote, which is what tells you why you went wrong.
Calculus, linear algebra, physics-style mechanics and chemistry stoichiometry problems. A symbol bar helps you enter powers, fractions, roots and integrals on desktop or mobile.
Yes. Learnex is AI-powered and AI can make mistakes, especially in long multi-step working. Check the flagged line against your textbook or notes. The lab explains the rule it applied so you can verify it yourself.
Practice the step-by-step logic exams actually test with Learnex Labs.
START FREE →Last updated 2026-11-04