Question

Задание на фото помогите

Answer 1

$1) sin(\alpha-\frac{\pi}2) + cos(\alpha - \pi) - tg(\alpha - \frac{3\pi}2) + ctg(2\pi - \alpha) = \\-cos\alpha - cos\alpha - ctg\alpha - ctg\alpha = -2(cos\alpha + ctg\alpha)\\2) tg(\frac{3\pi}2 - \alpha)tg(\pi + \alpha) - sin(\pi-\alpha)cos(\frac{\pi}2 + \alpha) = ctg\alpha tg\alpha + sin\alpha sin\alpha = sin^2\alpha + 1$