Помогите определить знак произведения
lg(sin32°) * lg(cos17°) * lg(tg40°) * lg (ctg20°)
lg(sin32°) * lg(cos17°) * lg(tg40°) * lg (ctg20°)
More Questions From This User See All
Copyright © 2025 SCHOLAR.TIPS - All rights reserved.
Answers & Comments
Verified answer
0 < sin32° < 10 < cos17° < 1
lg(sin32°) < 0
lg(cos17°) < 0
lg(sin32°) * lg(cos17°) > 0
------------------------------------
0 < tg40° < tg45° (=1)
lg(tg40°) < 0
ctg20° = tg70°
0 < tg45° < tg70°
1 < tg70°
lg(tg70°) > 0
lg(tg40°) * lg (ctg20°) < 0
произведение отрицательно