Can someone do a calculation on a TI Inspire CAS?

01302019, 09:18 AM
(This post was last modified: 01302019 09:20 AM by EdS2.)
Post: #16




RE: Can someone do a calculation on a TI Inspire CAS?
For those still unsure, the key here is that 3.1415926534 is not pi, it is an approximation to pi. So, an exact calculation of sin(x) using this number should not be zero  it should be approximately zero. (Edit: whereas sin(180) in degree mode should be exactly zero.)
Interestingly enough, HP themselves said the same thing, in 1976: Quote:There is a point where the new algorithms appear at first glance to be less accurate. If we calculate tan π in radians, the answer is 4.10 E 10 on the HP91 whereas the HP55 yields 0. This is misleading, for π on the keyboard should really be labeled π₁₀, showing that it is ten digits of π. ThusSee The New Accuracy: Making 2³ = 8, by Dennis. W. Harms in HP Journal, November 1976 page 17. 

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