Page 30 - Trigonometry
P. 30
cos( ) [2 sin( ) − 1]
= 0
sin( ) − 2sin ( )
2
cos( ) [2 sin( ) − 1]
= 0
sin( ) [1 − 2 sin( )]
Leaving
cot( ) = 0
3
This occurs when cos(x) = 0 which is = and . We
2 2
can verify this result by substituting these values into
the original equation,
sin(2 ) − cos( )
cos(2 ) + sin( ) − 1
First set up your fx calculator in radian mode
(q(SETUP)4) then enter the following keystrokes,
Caj2Q(X))pkJ(X))Rk
2J(X))+jJ(X))p1
r
X? qLP2=
26
