This deck contains important trigonometric formulas for class 11th.
| Front | \(\tan(\alpha + \beta) =\) |
| Back | \(\dfrac{\tan \alpha + \tan \beta}{1 - \tan \alpha \tan \beta}\) |
| Front | \(cos A + \cos B =\) |
| Back | \(2 \cos\left( \frac{A + B}{2} \right) \cos\left( \frac{A - B}{2} \right)\) |
| Front | \(\sin A + \sin B\) |
| Back | \(2 \sin\left( \frac{A + B}{2} \right) \cos\left( \frac{A - B}{2} \right)\) |