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 Math Function     

Mathematical function input key.
The keys are used to convert numbers in the X or X and Y registers. The only exception is PI this number is transferred to the X register.

First function key explanations. 
 1. SQR - Returns the square root of X. 
 2. X^2 - Return X squared. 
 3. LN - Returns the natural logarithm of X to base e.
 4. e^X - Return e (the base of natural logarithms) raised to the X power.
 5. X^Y - Returns X raised to the Y power.
 6. 1/X - Returns 1 divided by X.
 7. TAN - Returns the Tangent of X.
 8. COS - Returns the cosine of X. 
 9. SIN - Returns the sine of X.
10. HYP - Returns the hypotenuse of X.
11. PI - Transfers pi to the X Register.
12. ATN - Returns the arctangent of X.
13. NEG - Converts the X register negative to positive or positive to negative.
14. DEG - Converts X degrees to radians . 
15. LOG - Returns the natural logarithm of X.

Second function key explanations. 
Note: To show second function keys click on 2 FUNCT check box. This will bring up second function keys.
 1. M+X - Memory plus X.
 2. M-X - Memory minus X. 
 3. 10^X - Returns 10 to the X power.
 4. Y-XRT - Return Y to the X root.
 5. 3-RT - Returns cube root of X.
 6. 1/X - Returns 1 divided by X.
 7. COTAN - Returns the cotangent of X. 
 8. SEC - Returns the secant of X.
 9. COSEC - Returns the cosecant of X.
10. M CL - Clears memory.
11. RAD - Converts X radians to degrees. 
12. PI - Transfers pi to the X Register.
13. M*X - Memory multiplied by X.
14. M/X - Memory divided by X.
15. M^X - Memory to the X power.
16. - Reserved for future revisions.