1) cos^2 30 градусов - sin^2 45 градусов = (cos 30)^2 - (sin 45)^= (sqrt(3)/2)^2 - (sqrt(2)/2)^= 3/4 - 2/= 1/4
2) 3tg^2 30 градусов + 4tg 45 градусов + cos 30 градусов ctg 30 градусо= 3(tan 30)^2 + 4(tan 45) + cos 30 cot 3= 3(1/sqrt(3))^2 + 41 + (sqrt(3)/2)*(2/sqrt(3)= 3/3 + 4 + sqrt(3)/= 1 + 4 + sqrt(3)/= 5 + sqrt(3)/2
1) cos^2 30 градусов - sin^2 45 градусов = (cos 30)^2 - (sin 45)^
= (sqrt(3)/2)^2 - (sqrt(2)/2)^
= 3/4 - 2/
= 1/4
2) 3tg^2 30 градусов + 4tg 45 градусов + cos 30 градусов ctg 30 градусо
= 3(tan 30)^2 + 4(tan 45) + cos 30 cot 3
= 3(1/sqrt(3))^2 + 41 + (sqrt(3)/2)*(2/sqrt(3)
= 3/3 + 4 + sqrt(3)/
= 1 + 4 + sqrt(3)/
= 5 + sqrt(3)/2