f = If(x < -2, x + 3, If[x < 2, (4 - x^(2))^(0.5) + 1, 0.1 * x^(2) - 1])
A = Point(f)
a: x(A)
b: y(A)
B: (a, 0)
C: (0, b)
D: (2, f(2))
E: (1.99999, f(1.99999))
g(x) = csc(5 * x)
h(x) = cos(19 * x)
p(x) = ((2 * x + 1)^(0.5) - 1) / x
q(x) = x^(0.5)
r(x) = -x^(0.5)