Задача 62618 ...

61e116c811367515e09eb4a2

15.01.2022 17:15:16

Решите уравнения

2) sin π/4 * cos π/4 - sin π/3 * cos π/6;

4) 2 cos^2 π/6 - sin^2 π/3 - tg π/6 * ctg π/3.

5f3eaa23faf909182968dde0

15.01.2022 21:53:41

★

2) =(sqrt(2)/2)*(sqrt(2)/2)-(sqrt(3)/2)*(sqrt(3)/2)=1/2-3/4=(2-3)/4=-1/4
4) =2*(sqrt(3)/2)^(2)-(sqrt(3)/2)^(2)-(sqrt(3)/3)*(sqrt(3)/3)=
=3/2-3/4-1/3=(18-9-4)/12=5/12