$\sin x$ $\cos y$ $\tan z$

$1+2-3$ $\left(\sqrt{\frac{4}{5}}\right]$ $+\{\frac{\frac{6}{7}}{\frac{8}{9}}$

$\mathbf{x}$ $\mathit{sin}$ $x$ $\sin$

$\{\frac{\frac{6}{7}}{\frac{8}{9}}$ $\{\frac{\frac{6}{7}}{\frac{8}{9}}$

$-\sin x$