a. Nicole uses a graphing utility (Xmin = -2π, Xmax = 2π, Ymin = -2, Ymax = 2) and says that (sinx + 0.0l)2 - (sinx)2 + (0.0l)2 is an identity since the graphs of each side of the equation appears to coincide. Is Nicole correct when she says the graphs appear to coincide?
b. Robert says that the equation is not an identity since it is false if x = π/6. is Robert correct that the statement is false when x = π/6?
c, When the graphs appear to coincide, can we be sure that it is an identity? Explain why or why not.
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