sin 60° = √3/2cos 150° = -√3/2tg 45° = 1ctg 225° = -1
√3/2 - √3/2 + 1 * -1 = 1
Теперь упростим выражение: 1/Cos^2 α - tg^2α - Sin^2α
1/Cos^2 α - tg^2α - Sin^2α = 1/(Cos^2 α) - (Sin^2 α)/(Cos^2 α) - Sin^2 α = (1 - Sin^2 α)/(Cos^2 α) - Sin^2 α = Cos^2 α/Cos^2 α - Sin^2 α = 1 - Sin^2 α = Cos^2 α
Ответ: Cos^2 α
sin 60° = √3/2
cos 150° = -√3/2
tg 45° = 1
ctg 225° = -1
√3/2 - √3/2 + 1 * -1 = 1
Теперь упростим выражение: 1/Cos^2 α - tg^2α - Sin^2α
1/Cos^2 α - tg^2α - Sin^2α = 1/(Cos^2 α) - (Sin^2 α)/(Cos^2 α) - Sin^2 α = (1 - Sin^2 α)/(Cos^2 α) - Sin^2 α = Cos^2 α/Cos^2 α - Sin^2 α = 1 - Sin^2 α = Cos^2 α
Ответ: Cos^2 α