Vault Of Euclid

Vector Triple Product of Mutually Perpendicular Vectors

Series of numbers warmup

If \( \mathbf{A} \), \( \mathbf{B} \), \( \mathbf{C} \) are mutually perpendicular, show that \( \mathbf{A} \times (\mathbf{B} \times \mathbf{C}) = \mathbf{0} \).
cross-productvector-triple-productmutually-perpendicularorthogonal-vectorsparallel-vectorszero-vectormultivariable-calculusvector-algebra3d-geometryprove-identitylinear-independencevector-calculus

The solution and a full step-by-step explanation are here. Sign in to read them.

What you need first

What this problem tests

Tests the geometric understanding of the cross product, specifically its orthogonality to the operands and its behavior with parallel vectors.

This is a standard introductory problem in multivariable calculus and vector algebra, testing geometric intuition over algebraic expansion.

More on Series of numbers