Matematika A - 2013. jesen, 8.

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

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

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

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