Помогите с алгеброй! Даю 40 баллов!
1) найти наименьшее значение функции
y=√(67+3(sin^2x-cos^2x))
2) (22sin144°*cos144°)/sin288°
3) (5sin a + 16cos a)/(2sin a - 17cos a)=1/2 найти tg a
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