Assinale a opção que indica a soma dos elementos de $A\cup B$, sendo:$$A=\left\{x_k={\mathrm{sen}}^2\left(\frac{k^2\pi }{24}\right):k=1,2\right\}$$ $$B=\left\{y_k={\mathrm{sen}}^2\left(\frac{(3k+5)\pi }{24}\right):k=1,2\right\}$$