cos(α) = 1/3
sinα, tanα, sin(90°-α), cos(90°-α), tan (90°-α)
sin(α)^2 + cos(α)^2 = 1
sin(α) = √(1 - cos(α)^2) = 2/3·√2
tan(α) = sin(α)/cos(α) = 2/3·√2 / (1/3) = 2·√2
sin(90°-α) = cos(α) = 1/3
cos(90°-α) = sin(α) = 2/3·√2
tan(90°-α) = sin(90°-α) / cos(90°-α) = cos(α) / sin(α) = 1/3 / (2/3·√2) = 1/4·√2