sin B=\sqrt{1-cos^2 B}=\sqrt{1-(\frac{5}{\sqrt{41}})^2}=\frac{4}{\sqrt{41}};
tg B=\frac{sin B}{cos B}=\frac{\frac{4}{\sqrt{41}}}{\frac{5}{\sqrt{41}}}=\frac{4}{5}=0.8" alt="sin A=cos B=\frac{5}{\sqrt{41}}; 0^o
sin B=\sqrt{1-cos^2 B}=\sqrt{1-(\frac{5}{\sqrt{41}})^2}=\frac{4}{\sqrt{41}};
tg B=\frac{sin B}{cos B}=\frac{\frac{4}{\sqrt{41}}}{\frac{5}{\sqrt{41}}}=\frac{4}{5}=0.8" align="absmiddle" class="latex-formula">