Question

(cos 75 градусов - sin 75 градусов)²
$frac{tg ^{2}22а30'-1}{tg22а30'}$$frac{tg ^{2}22 }{tg}$

Answer 1

(cos75-sin75)²=cos²75-2cos75sin75+sin²75=1-sin150=1-sin30=1-1/2=1/2
(tg²22гр30м-1)/tg22гр30v=-1/2tg45==-1/2