Fx-83es i am having trouble finding the 'INV' button. in my revision guide it says to use it but i cant find it anywhere. there is an 'In' button but when i try and use that in my equation it doesnt give the answer the book has given. i have git my exam tommorow and really need 2 no.??

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Try 1/x button, does that give you the correct answer ? guessing the inverse ?

Posted on Jun 01, 2008

• Mikey1963 Jun 01, 2008

sorry on that model it is the X-1 key

eg enter 1/10 as fraction using the a Ab/c button, press = then press the X-1 key then = again to change to answer from 1/10 to 10

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You didn't specify what calculator you have.

On my TI30XA, 0.6339869 '2nd' 'COS-1' gives 50.655114
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look for something with line in it

Steve :P

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Press Shift and then In

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