text: "Can be found in gpkit/docs/source/examples/sin_approx_example.py"
  import numpy as np
  from gpkit import Variable, Model
  
  
  x = Variable("x")
  y = Variable("y")
  
  objective = y
  
  constraints = [y >= x,
                 x <= np.pi/2.,
                 x >= np.pi/4.,
                ]
  
  m = Model(objective, constraints)
  print m.solve(verbosity=0).summary()
  