The document contains mathematical equations for calculating various trigonometric functions including cosine, sine, and tangent. It defines the functions in terms of other functions and variables through a series of equalities and additions.

1. z t oJ 0
s t7: I (_?+l )
7T
r :fl1( j)5-L i J
zz7
f Zr + i-l.e + {a z r
7z
+; {zs +
5zk1 r
ZY
zE z v
) l to (7 t
ts)
Z
J
z3
I
i7
I
37
I5z
I
i{.fD
r)Z
(0 ( Z(010)t0"r 5d'ztcgSQ r
lO L^oS p )
+ {tcs Lt 0 t trtas Zta4ta)
I cosste + 5 cus 3g +
cos6 1
CysU: I tZt,! )
LL
(os60=(t (r+lf 'l
( : I L 6.zr xt + I x Zo s
;al-,T L
Za* + ? x | )
zr
. (z( zq +tf z' r _ I J)
: (zs F + zV+ I lE + rZo)
6
: (zca 0 | (zc ) zt)
+ ?0 )
: I (rur 6U
5t"