Question

Вычислите:sina,tga,ctga, если cosa=1/2

Answer 1

sin²a = 1-cos²a

sin²a  = 1-1/4 = 3/4

sin a = √3/2

tga = sin a /cosa

tga =√3/2:1/2 = √3

ctga  = 1/tga

ctga  = 1/√3