Matematika A - 2013. jesen, 8.

$-\frac{4}{3}{\mathrm{ctg}}^{2}x-\backslash frac\{4\}\{3\}\; \backslash operatorname\{ctg\}^\{2\}\; x$

$-\frac{4}{3}{\mathrm{tg}}^{2}x-\backslash frac\{4\}\{3\}\; \backslash operatorname\{tg\}^\{2\}\; x$

$2{\mathrm{ctg}}^{2}x2\; \backslash operatorname\{ctg\}^\{2\}\; x$

$2{\mathrm{tg}}^{2}x2\; \backslash operatorname\{tg\}^\{2\}\; x$