Tandy 1000 Basic Reference Manual

Appendix A
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Derived BASIC Functions
Functions which are not intrinsic to BASIC may be calculated as
follows:
Function
SECANT
COSECANT
CONTANGENT
INVERSE SINE
INVERSE COSINE
INVERSE SECANT
INVERSE
COSECANT
INVERSE
COTANGENT
HYPERBOLIC
SINE
HYPERBOLIC
COSINE
HYPERBOLIC
TANGENT
HYPERBOLIC
SECANT
HYPERBOLIC
COSECANT
HYPERBOLIC
COTANGENT
INVERSE
HYPERBOLIC
SINE
INVERSE
HYPERBOLIC
COSINE
INVERSE
HYPERBOLIC
TANGENT
BASIC Equivalent
SEC(X) = 1/COS(X)
CSC(X)
= l/SIN(X)
COT(X)
= l/TAN(X)
ARCSIN(X)
= ATN(X/
SQR(
- X*X + 1))
ARCCOS(X) = - ATN(X/
SQR(
- X*X + 1)) + 1.5708
SQR(X*X
- 1)) + (SGN(X) - 1)
ARCCSC(X) = ATN(X/SQR(X*X - 1))
+ (SGN(X) - 1)*1.5708
ARCSEC(X)
= ATN(X/
*1.5708
ARCCOT(X)
= ATN(X) + 1.5708
SINH(X)
= (EXP(X) - EXP( - X))/2
COSH(X)
= (EXP(X) + EXP( - X))/2
TANH(X)
= (EXP(X) - EXP( - XI)/
(EXP(X)
+ EXP( - X))
SECH(X)
= 2/(EXP(X) + EXP( - XI)
CSCH(X)
= SI(EXP(X1- EXP( - XI)
COTH(X)
= (EXP(X) + (EXP( - X))/
(EXP(X)
- EXP( - X))
ARCSINH(X1
= LOG(X
+ SQR(X*X + 1))
ARCCOSH(X) = LOG(X
+ SQR(X*X - 1))
ARCTANH(X) = LOG((l+ XI/( 1 - X))/
2
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Tandy 1000 Specifications

General

Processor	Intel 8088
Processor Speed	4.77 MHz
RAM	128 KB (expandable to 640 KB)
Operating System	MS-DOS 2.11
Manufacturer	Tandy Corporation
Release Year	1984
Storage	Single or double 5.25" floppy disk drive (360 KB), optional hard drive
Sound	Tandy 3-voice sound
Ports	Parallel, Serial
Graphics	CGA (Color Graphics Adapter)
Graphics Modes	320x200, 640x200