Вычислить: 1) sin (3П/2 - а), если cos a=0,8
2) sin 210 - cos 120 + tg 225
1) sin(3Pi/2-a) = -cosa = -0,8
2) sin210-cos120+tg225 = sin(180+30)-cos(90+30)+tg(180+45) = -sin30+sin30+tg45 = tg45 = 1
Copyright © 2024 SCHOLAR.TIPS - All rights reserved.
Answers & Comments
1) sin(3Pi/2-a) = -cosa = -0,8
2) sin210-cos120+tg225 = sin(180+30)-cos(90+30)+tg(180+45) = -sin30+sin30+tg45 = tg45 = 1