Question

Найти sin tg ctg если cos=0.8

Answer 1

tg = sin/cos

ctg = cos/sin

 

 sinA = корень(1-cos^2 A) = корень(1 - 0,64) = корень(0.36) = 0.6  

tgA = 0.6/0.8 = 3/4

 ctgA = 1/tgA = 4/3