Section 3.5.  Read the entire section. Answer the following questions by 7:00 am.  Send an e-mail with subject line MA251 to .

1) What does the graph of y = - sqrt(25-x^2) look like?  (See Example 2.  That is a minus sign in front of sqrt.  sqrt means "radical sign" or "square root")

1. A half circle below the x-axis
Wilson Spivey

2) If x^4 + y^4 = 16, find y'  .

2. y'= -(x^3/ y^3)

Archie Rich

3) What is the derivative of (tan^(-1)  x)?  (This is the inverse tangent function, also called arctan x ).

Deonte Johnson