# Determining x Undefined > This section finds the x at which a trigonometric expression or identity is undefined. Division by zero is illegal: set every denominator equal to 0, solve with CAST / the general solution already… - Page: https://www.hlayiso.com/grade-12/mathematics/notes/trigonometry/determining-x-undefined Breadcrumbs: [Home](https://www.hlayiso.com/) › [Grade 12](https://www.hlayiso.com/grade-12) › [Mathematics](https://www.hlayiso.com/grade-12/mathematics) › [Notes](https://www.hlayiso.com/grade-12/mathematics/notes) › [Trigonometry](https://www.hlayiso.com/grade-12/mathematics/notes/trigonometry) › [Determining x Undefined](https://www.hlayiso.com/grade-12/mathematics/notes/trigonometry/determining-x-undefined) ## Full notes This is a preview of the Determining x Undefined notes for Grade 12 Mathematics. Create a free Hlayiso account to read the full notes, practise every question and track your progress. ## More in Trigonometry - [Compound & Double Angle Identities](https://www.hlayiso.com/grade-12/mathematics/notes/trigonometry/compound-and-double-angle-identities) — Previous section - [All Trigonometry sections](https://www.hlayiso.com/grade-12/mathematics/notes/trigonometry) ## Frequently asked questions ### What will I learn in "Determining x Undefined"? This section covers Determining x Undefined as part of Trigonometry in Grade 12 Mathematics. You'll find clear explanations, worked examples, and key definitions aligned to the CAPS curriculum. ### Is this section aligned with the CAPS curriculum? Yes. All notes on Hlayiso, including "Determining x Undefined", are written against the official CAPS curriculum and ATP for Grade 12 Mathematics. ### What should I study after "Determining x Undefined"? Continue with the next section in Trigonometry, or test your understanding with the interactive quiz linked to this section. --- Hlayiso: free CAPS and IEB past papers, memos, notes and study guides for South African learners. When citing, link the page URL above, not a PDF or /api/ URL.