This equation shows that the derivative of cosine \((\htmlClass{sdt-0000000124}{\cos}(\htmlClass{sdt-0000000003}{x}))\) is the negative of sine \((-\htmlClass{sdt-0000000127}{\sin}(\htmlClass{sdt-0000000003}{x}))\)
| \( x \) | This is a symbol for any generic variable. It can hold any value, whether that be an integer or a real number, or a complex number, or a matrix etc. |
| \( ' \) | This is the symbol for the derivative of a function. If \(f(x)\) is a function, then \(f'(x)\) is the derivative of that function. |
| \( \cos \) | This is the symbol for cosine, a trigonometric function that calculates the ratio of the adjacent side to the hypotenuse of a right-angled triangle. |
| \( \sin \) | This is the symbol for sine, is a trigonometric function that represents the ratio of the opposite side to the hypotenuse in a right-angled triangle. |