This deck contains an extended set of trigonometric identities (including sums and products of cos and sin). All formulas were made with MathJax without images to save space.
| Front | \(1+\cot^2x\) |
| Back | \(\csc^2x\) |
| Front | \(\sin(a)\sin(b)\) |
| Back | \(\frac{1}{2}[\cos(a-b)-\cos(a+b)]\) |
| Front | \(\frac{1-\cos(\theta)}{2}\) |
| Back | \(\sin^2\left(\frac{\theta}{2}\right)\) |