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Solution 34616: Inverse Cosine of the Tangent of -5π/4 on the TI-83 Plus and TI-84 Plus Family of Graphing Calculators.

...lmost all computers. The main problem is tan(-5*π/4). The TI-83 Plus and TI-84 Plus family of graphing calculators only perform calculations with 14 digits in the memory, the calculation of tan (-5*π/4) loses some accuracy on the last digit. Internally, the answer of tan(-5*π/4) is not -1 but som...
https://education.ti.com/en/customer-support/knowledge-base/ti-83-84-plus-family/product-usage/34616

Solution 34835: Storing Graph Elements on the TI-83 Plus and TI-84 Plus Family of Graphing Calculators.

...emory at any given time. Please Note: GDB's do not contain drawn items or stat plot definitions. Storing a graph database: 1) Press [2ND] [DRAW] [Right Arrow] [Right Arrow] to select the STO menu. 2) Press [3] to select 3:StoreGDB. 3) Input a number from (0-9) of the GDB variable to which ...
https://education.ti.com/en/customer-support/knowledge-base/ti-83-84-plus-family/product-usage/34835