+118680 That is the reciprocal button Aziz. 
I am not sure what you mean by the inverse button.
The 2nd is in the top left corner like it is with most calculators.
Perhaps you mean inverse trigonometry?
inverse sine is the same as arc sine. So sin-1 is the same as asin
This is probably what you needed to know.
+4473 The inverse button on this calculator is the "1/x" which is the fourth button on the 1st row.
+118680 That is the reciprocal button Aziz.
I am not sure what you mean by the inverse button.
The 2nd is in the top left corner like it is with most calculators.
Perhaps you mean inverse trigonometry?
inverse sine is the same as arc sine. So sin-1 is the same as asin
This is probably what you needed to know.
