ПОЖАЛЙСТА! С дано: cost=3\4

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)