\( \begin{aligned}
& \sin (A \pm B)=\sin A \cos B \pm \cos A \sin B \\
& \cos (A \pm B)=\cos A \cos B \mp \sin A \sin B \\
& \tan (A \pm B)=\frac{\tan A \pm \tan B}{1-\tan A \tan B}
\end{aligned} \)
\( \frac{d y}{d x}=\frac{d y}{d u} \times \frac{d u}{d x}\)
\(\binom{x}{y}\)
\(
\left(\begin{array}{l}
x \\
y \\
z \end{array}\right)
\)
\(\operatorname{cosec} \theta=\frac{1}{\sin \theta}\)
\(\cos A=\frac{b^2+c^2-a^2}{2 b c}\)
\(\cot \theta=\frac{1}{\tan \theta}\)
\(\int_a^b y d x\)
\(\frac{d y}{d x}=f(x) g(y)\)
