If $${\text{tan }}\alpha= 2,$$then the value of $$\frac{{{\text{cose}}{{\text{c}}^2}\alpha- {\text{se}}{{\text{c}}^2}\alpha }}{{{\text{cose}}{{\text{c}}^2}\alpha+ se{c^2}\alpha }}$$is?

• A. $ - \frac{5}{9}$$
• B. $\frac{3}{5}$$
• C. $ - \frac{3}{5}$$
• D. $\frac{{17}}{5}$$