Question

Вычислить: tg (arccos 0,8)

Answer 1

$tt tg(arccos0.8)=dfrac{sin(arccos0.8)}{cos(arccos0.8)} =dfrac{sqrt{1-cos^2(arccos0.8)}}{cos(arccos0.8)}=\ \ \ =dfrac{sqrt{1-0.8^2}}{0.8}=dfrac{0.6}{0.8} =0.75$

Ответ: 0,75.