kat-alpha-jest-ostry-i-displaystyle-cosalpha-frac37-wtedy

A)

$\displaystyle \sin\alpha= \frac{2\sqrt{10}}{7}$ \displaystyle \sin\alpha= \frac{2\sqrt{10}}{7}

B)

$\displaystyle \sin\alpha= \frac{\sqrt{10}}{7}$ \displaystyle \sin\alpha= \frac{\sqrt{10}}{7}

C)

$\displaystyle \sin\alpha= \frac{4}{7}$ \displaystyle \sin\alpha= \frac{4}{7}

D)

$\displaystyle \sin\alpha= \frac{3}{4}$ \displaystyle \sin\alpha= \frac{3}{4}