ПОЖАЛЙСТА!!!с

 

дано:
cost=3\4;

0<t<п\2

Найти: cos t\2,  sin t\2,  tg t\2 и  ctg t\2.

cost = 3/4

cos(t/2) = ((1 + cost)/2)^(1/2) = ((1 + 3/4)/2)^(1/2) = (7/8)^(1/2) = (7^(1/2))/(2*(2^(1/2)))

sin(t/2) = (1 - cos^2(t/2))^(1/2) = (1 - 7/8)^(1/2) = 1/(8^(1/2)) = 1/(2*(2^(1/2)))

tg(t/2) = sin(t/2)/cos(t/2) = (1/(2*(2^(1/2))))/((7^(1/2))/(2*(2^(1/2)))) = 1/(7^(1/2))

ctg(t/2) = 1/tg(t/2) = 7^(1/2)