Evaluate the integral ${\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}se{c}^{6}xta{n}^{6}xdx$

$\frac{1}{7}se{c}^{7}x-\frac{2}{9}se{c}^{9}x+\frac{1}{11}se{c}^{11}x+C$

$\frac{1}{7}se{c}^{7}x+\frac{2}{9}se{c}^{9}x+\frac{1}{11}se{c}^{11}x+C$

$\frac{1}{49}se{c}^{7}xta{n}^{7}x+C$

$\frac{1}{7}ta{n}^{7}x-\frac{2}{9}ta{n}^{9}x+\frac{1}{11}ta{n}^{11}x+C$

$\frac{1}{7}ta{n}^{7}x+\frac{2}{9}ta{n}^{9}x+\frac{1}{11}ta{n}^{11}x+C$