Question

sin a= -53 , где 3п2<a<2п найдите cos, tg, ctg

Answer 1

Cos a =√1-sin ²a=√1-(-5/3)²=√1-25/9=4/3 tg a = sin a/cos a= (-5/3)/(4/3)=-5/4 Ctg a= cosa/sin a=(4/3)/(-5/3)=-4/5