Question

1)
${ cos }^{2} (x) + 76 sin(x) + 155 = 0$
2)
${ cos}^{2} (x) + 25 cos(x) = 26$
3)
$14 sin(x) = cos(x)$

Answer 1

Это 3
1 и 2 не знаю
～～～