185. tga=3
sin^2x = 1 - cos^2x = 1 - 1/10 = 9/10sin x = 3/sqrt (10) при (pi, 2pi)Значит, sqrt(10)*sinx=sqrt (10)*3/sqrt (10) = 3186. tgx=0,51+tg^2x = 1/ cos^2x1/cos^2x = 1,25cos^2x = 4/5cosx=+- 2/sqrt(5)cosx = 2/sqrt (5) при (-pi/2, pi/2)Значит, 1/sqrt (5)*2/sqrt (5)=2/5187. tga=51+tg^a = 1/ cos^2a1/cos^2a = 26cos^2a = 1/26cosa = +- 1/sqrt (26)cosa = -1/sqrt(26) при (pi, 3pi^2)
и cosa=+1/sqrt (26) при (3pi/2, 2pi) \frac{ \sqrt{2} }{ \sqrt{13} \times \frac{ 1}{ \sqrt{26} } } = 2188. tga=-71+tg^2a = 1/ cos^2a1/cos^2a = 50cos^2a = 1/50cosa = 1/(5*sqrt (2)) при (7pi/2,9pi/2)sin^2a = 1 - cos^2a = 1 - 1/50 = 49/50sina = -7/(5*sqrt (2)) при (7pi/2, 4pi)
sina = + 7/(5*sqrt (2)) при (4pi, 9pi/2) \frac{9}{ \sqrt{2} \times \frac{ 7}{5 \sqrt{2} } } = \frac{45}{7} 189.