Решите оба.
1) tg 30 градусов + sin 60 градусов
2) 2cos^2 45 градусов - cos^2 30 градусов
1) tg 30 градусов + sin 60 градусов
2) 2cos^2 45 градусов - cos^2 30 градусов
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Answers & Comments
sin60=√3/2
tg30+sin60 = 1/2
cos45 = √2/2
cos30 = √3/2
2cos²45+cos²30= 2×(√2/2)²+(√3/2)² = (2×1/2)+3/4=1+3/4=1 целая 3/4 или же просто 1,75