\left \{ {{x_1=\frac{\pi }{2}+\pik, k \in Z} \atop {x_2+5= \pi k ,k \in Z }} \right. =>\left \{ {{x_1=\frac{\pi }{2}+\pik, k \in Z} \atop {x_2=\pi k -5, k \in Z }} \right." alt="cos(x)*tg(x+5)=0\\\\\left \{ {{cosx=0} \atop {tg(x+5)=0}} \right. =>\left \{ {{x_1=\frac{\pi }{2}+\pik, k \in Z} \atop {x_2+5= \pi k ,k \in Z }} \right. =>\left \{ {{x_1=\frac{\pi }{2}+\pik, k \in Z} \atop {x_2=\pi k -5, k \in Z }} \right." align="absmiddle" class="latex-formula">