cost = корень из (1 - sin^2t) = корень из (1 - 25/169) = корень из 144/169 = 12/13
т.к. <span>П/2 < t < П, то cost < 0, cost = -12/13</span>
<span>tgt = sint/cost = (5/13)/(-12/13) = -5/12</span>
<span>ctgt = 1/tgt = -12/5</span>
Cos150° = cos(180°-30°)=cos(π-30°)= - cos30° = -√3/2