Class notes

,
, derivations :




·

derivations of principle
etrees
equations

remember
-

:




O =
(00y) + (UX0Y) 10528 +
2xy . Sin 20
equ
I


& ot
(8x=
(y)(
2 sin28)
[xy(2(0S20) 0
- + =
=


d



(sin =) note :
the solution to the expression of tan 28



=
=> tanzo
yields
2 values
of f

y in Ep ,
and Opz



to represent tan funcion
-
comviruct
triangles
:




tan is positive

in this


quadrant
-



(00y) Exy
↑




·
⑳ CAP .




-




Essy
[0)
tan is

in this
negutic
guadrant

, looking
at
Right
the hand
triangle

2p

*
Sin ,
=




:
los28p

c

- rub then wo 1
equ .




Sop =
a =
(0)
=>
looking at
left hand
triangle