Question: how to fnint on ti 84?
Answer: The TI-83/84 computes a definite integral using the fnint( ) function. To access the function, press the [ MATH ] button and then scroll up or down to find 9:fnint( . , which evaluates to –2(cos π/4 – cos 0) = –2(√(2)/2 – 1) = 2–√(2), approximately 0.5858.