Vector Basic Interpreter Basic 80 Reference Manual - page 133
of
190
Returns the t.angent.
of X in radians.
TAN (X)
is
calculated
in
single
prec1s10n.
If
TAN
overflows,
the
"Overflow"
error
message
is
displayed, machine infinit.ywith the appropriat.e
sign is supplied as t.he result., and
execut.ion
continues.
SK,
Extended, Disk
Calls the user's
assembly
language
subroutine
with
the argument X.
Extended ~~d Disk versions only.
in
the
range
0
t.o9 and corresponds t.othe digit.
supplied with the DEF
USR
st.atement for
that
routine.
If
is
omitted,
USRO
is
assumed.
See Appendix
c.
40
B
=-
T*SIN(Y)
50
C
=
USR(B/2)
60
D
=
USR(B/3)