1) sin150° × cos135° × tg120° = 1/2 × (- √2/2) × (-√3) = 1×√2×3/2×2 = √6/4
2) tg²150° - 2sin²135° + 6sin0° × tg279° = (- √3/3)² - 2×(√2/2)² + 6×0 × tg279° = 3/9 - 2×2/4 + 0 = 3/9 - 1 + 0 = 3/9 - 1 = -2/3
ответ: 1) √6/4; 2) -2/3
1) sin150° × cos135° × tg120° = 1/2 × (- √2/2) × (-√3) = 1×√2×3/2×2 = √6/4
2) tg²150° - 2sin²135° + 6sin0° × tg279° = (- √3/3)² - 2×(√2/2)² + 6×0 × tg279° = 3/9 - 2×2/4 + 0 = 3/9 - 1 + 0 = 3/9 - 1 = -2/3
ответ: 1) √6/4; 2) -2/3