JEE Maths shortcuts — share what actually saved you in the exam

Cracking JEE Main this year. What's one shortcut you actually used in the exam (not just learned)?

For complex numbers: rotation as multiplication by e^iθ — saves 90s on geometry questions. Game changer.

Coordinate geometry: parametric form for parabola. Most JEE-style integration with parabola becomes 2 lines.

Vectors: dot/cross product geometric interpretation > component-wise calc for most JEE problems.

Differentiation: log differentiation for products of multiple terms saves 60% time on chain rule questions.