For any calculator
Sec(Secant) = 1/Cos
Csc (Cosecant) = 1/ Sin
Cot (Cotangent) = 1/Tan
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The TI 84 Plus Silver Edition has a replaceable cover which you can have a different color on. And it also has a larger capacity for memory.
The TI 84 calculator is a Texas Instruments graphing calculator. These are widely available at stores such as Walmart, Office Depot and Best Buy. They are also available online from Amazon or eBay.