Sinα=1/3 tgα=√2/4 cos-?

tgα=[latex] \frac{sin \alpha }{cos \alpha } [/latex] cosα=[latex] \frac{sin \alpha }{tg \alpha } [/latex] cosα=[latex] \frac{1}{3}: \frac{ \sqrt{2} }{4}= \frac{4}{3 \sqrt{2} } = \frac{2 \sqrt{2} }{3} [/latex]