Дано:sin a=1/4 пи/2

Ак: ctg (a) = - 0.2, tg (a) = 1/ctg (a) = 1 / (-0.2) = - 5;

(ctg (a)) ^2=0.04, (cosec (a) ^2=1 / (sin (a)) ^2=1 + (ctg (a)) ^2=1+0.04=1.04, (sin (a)) ^2=1/1.04, sin (a) = - 1/sqrt (1.04);

(cos (a)) ^2=1-1/1.04=0.04/1.04, cos (a) = 0.2/sqrt (1.04).