Find the foot of perpendicular from a point to a line in 3D.
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More about Basic Properties of Circles. Basic Trigonometry. Mensuration. Data Handling. Nil. Page 4. Module 1. Binomial Expansion. HKUGA College DSE M2 All-In-One Note PDF - Scribd Find the foot of perpendicular from a point to a line in 3D
: Many old past papers (pre-2012) or textbook exercises include questions that are no longer in the DSE syllabus. Check out this guide on Out-of-Syllabus M2 Questions to avoid wasting time on topics like the differentiation of secant or cotangent functions unless specifically given in a prompt. More about Basic Properties of Circles
A concise formula sheet—limits, differentiation rules, integration formulas, standard series, and solution templates for first-order linear differential equations—saves time during revision. Including short, reliable computational tricks (e.g., completing the square for integrals, choosing substitution by recognizing derivative patterns) can significantly improve accuracy under exam time pressure.
For a system $AX = B$ where $A$ is $n \times n$ and $\det A \neq 0$: $$x_i = \frac\det A_i\det A$$ ($A_i$ is matrix $A$ with the $i$-th column replaced by $B$).