sinα = 3/5;
cosα = √(1 - sin²α)
cosα = √(1 - 9/25) = √(16/25) = 4/5
tgα = sinα/cosα = (3/5)/(4/5) = 3/4
ctgα = 1/tgα = 1/(3/4) = 4/3
sinα = 3/5;
cosα = √(1 - sin²α)
cosα = √(1 - 9/25) = √(16/25) = 4/5
tgα = sinα/cosα = (3/5)/(4/5) = 3/4
ctgα = 1/tgα = 1/(3/4) = 4/3