Question $5(1$ point$)$

Determine the exact value of $cm(\frac{13}{12})$

a$)\frac{1\sqrt[\phantom{2}]{3}}{2\sqrt[\phantom{2}]{2}}$

b$)\frac{1-\sqrt[\phantom{2}]{3}}{2\sqrt[\phantom{2}]{2}}$

c$)\frac{\sqrt[\phantom{2}]{3}-1}{2\sqrt[\phantom{2}]{2}}$

d$)\frac{-1-\sqrt[\phantom{2}]{3}}{2\sqrt[\phantom{2}]{2}}$