Question

Найти cosa, ctga если sin=0.6

Answer 1

$cos^2a=1-sin^2a \ cos^2a=1-0.36 \ cos^2a=0.64 \ cosa=0.8$

$ctga= frac{cosa}{sina}= frac{0.8}{0.6} = frac{4}{5}* frac{5}{3} = frac{4}{3}$