If you want to take the square root of 81, press 2nd SQUARE 81 =, and the calculator will show you the result: 9. But look under the 2nd functions, which are different functions or operations written above the buttons… In this video you will be shown where and how to use the reciprocal key on a Casio Classwiz fx-GT85x scientific calculator. Starting with the fifth row of the TI-84 Plus calculator, you find the functions commonly used on a scientific calculator. Square Roots There is also a special key for taking a square root. Reciprocal of a fraction calculator: If you are struggling with how to find reciprocal of a fraction don't worry as you can take the help of our easy to use Reciprocal of a fraction calculator. Continue reading to know more about What is a Reciprocal of a fraction and how it … Don’t get confused and use the sin –1, cos –1, and tan –1 buttons, either. Unfortunately many students are unaware of the capability of many calculator keys. The reciprocal key can be found on the third row of … So let's find the reciprocal of 5. Here’s what they are and how you use them: π and e The transcendental numbers π and e are respectively located in the fifth and sixth rows of the last column of the keyboard. Cosecant is the reciprocal of sine. To find the cosecant of an angle using a calculator, find the sine of that angle (using the Sin button) and then divide 1 by the result. On scientific calculators, the –1 or x–1 button means to find the reciprocal of a number. It's the 2nd function of the SQUARE button. You must use their reciprocals — sine, cosine, and tangent. The TI-89 Scientific Calculator: Using the Reciprocal Function By Patrick Hoppe. Those buttons are … This is the first in an occasional series of posts that will help students learn how to make better use of the calculator. This reciprocal button allows you to find the value of a reciprocal function when you’re working with a number. 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