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Q: Where is cos2 on a ti-83 plus calculator?

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Well, ti83s don't have archive memory(ti83 plus does though) while ti84 has archive. Ti84s allow you to start a two digit label with a letter, while ti83 doesn't, which is why there is an ERR:VERSION when you try to transfer programs with labels like A4 from ti84 to ti83. Also, ti84s default connection cord is different from that of them ti83, and ti84 uses a mini-USB as ti83 uses a different one, the one labeled 'I/O' on the ti84.

cos2 + cos2tan2 = cos2 + cos2*sin2/cos2 = cos2 + sin2 which is identically equal to 1. So the solution is all angles.

The TI-83 calculator uses 4 AAA batteries.

You cannot. A calculator is programmed. It is made to calculate correctly.

There are online graphing calculators. However, as of writing, there is no emulated TI83 that runs within your browser. On the other hand, if you have a Ti83, it is possible to copy its ROM to run an emulated TI83 on your desktop via one of many emulators.

change the batteries! There are two types of batteries in the ti83 calculator -- ordenary AAA batteries and one flat one. Buy new ones and change ... or else be more specific when asking. Yenn, DK

To determine what negative sine squared plus cosine squared is equal to, start with the primary trigonometric identity, which is based on the pythagorean theorem...sin2(theta) + cos2(theta) = 1... and then solve for the question...cos2(theta) = 1 - sin2(theta)2 cos2(theta) = 1 - sin2(theta) + cos2(theta)2 cos2(theta) - 1 = - sin2(theta) + cos2(theta)

Use these identities: sin2(x) + cos2(x) = 1, and tan(x) = sin(x)/cos(x) For clarity, the functions are written here without their arguments (the "of x" part). (1 - sin2) = cos2 (1 + tan2) = (1 + sin2/cos2) = (cos2+sin2) / cos2 = 1/cos2 Multiply them: (cos2) times (1/cos2) = 1'QED'

It will depend on the class. Nothing is impossible without the TI83, but some classes might require it so you can graph and write programs to go along with the math curriculum.

yes use the FRAC key (it's next to ☺)

Some TI83's can be set up differently, so it is highly recommendable to read the user guide for the TI83 in question. The user would need to go into the VarStat option and enter all the appropriate fields to have the calculator bring in the appropriate variables and totals.

No. I believe TI83+ and TI84 do use an operating system.

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