---

1.
a = sqrt(cos(8.8)-sin(1.3*pi))/(0.9*pi+(log(20))^2) - sqrt(log(18.5))*(4-exp(1/2))
2.
x = sin(3.2)/(8*log(7.3));
y = cos(8.6*pi)/sin(7.6*pi);
z = (1/tan(7.25))/cos(5.8);
t = (tan(7.46)/cos(8.5*pi))^4;

b = sqrt(x + y - z)/t