Question

СРОЧНО!!! Очень нужна помощь!!!

Answer 1

$\sin {\alpha} = \sqrt{1-(\frac{2}{7})^2}=\sqrt{\frac{45}{49}} = \frac{\sqrt{45}}{7}\\\tan {\alpha} = \frac{\sin \alpha} {\cos {\alpha}} = \frac {\frac{\sqrt{45}}{7}} {\frac{2}{7}} = \frac {\sqrt{45}}{2}$