Evaluate ${\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}si{n}^{3}xco{s}^{3}xdx$

Select one:

a$.-\frac{co{s}^{4}x}{4}\frac{co{s}^{6}x}{6}C$

b$.\frac{co{s}^{4}x}{4}-\frac{co{s}^{6}x}{6}C$

c$.-\frac{co{s}^{3}x}{3}\frac{co{s}^{5}x}{5}C$

d$.\frac{co{s}^{3}x}{3}-\frac{co{s}^{5}x}{5}C$