Question

sin A =1/2, найти cos A , tg A

Answer 1

$sin ^{2} x + cos ^{2} x = 1$
$cos ^{2} x= 1- sin ^{2} x$
$cos ^{2} x = 1 - ( frac{1}{2} ) ^{2}$
$cos ^{2} x = 1- frac{1}{4}$
$cos ^{2} x = frac{3}{4}$
$cosx= frac{ sqrt{3} }{2}$

$tg= frac{1}{ sqrt{3} }$....

Answer 2

черт

Answer 3

короче в конце tg= sin/cos .