kill(all)$

load(ntrig)$
load(atrig1)$

van=facebook.com/LearningCalculus;

f(x,y,z):=4*sin(x)^2 = 4*cos(3*y)+(3-4*sin(z))^2;

g(x,y,z):=4*sin(y)^2 = 4*cos(3*z)+(3-4*sin(x))^2;

h(x,y,z):=4*sin(z)^2 = 4*cos(3*x)+(3-4*sin(y))^2;

f(%pi/6,%pi/6,%pi/6);

g(%pi/6,%pi/6,%pi/6);

h(%pi/6,%pi/6,%pi/6);