9b)
got theta = 180 but there are two more values
#trig equations
sharp abyss
(y+1)(-y+4x) so
(cosx + 1)(-cosx + 4sinx) = 0
cosx = -1 so x = 180
4sinx - cosx = 0 <=> 4sinx = cosx <=> tanx = 1/4 <=> x = arctan 1/4
little gyro
i have no idea what arctan means
sharp abyss
tan^-1
little gyro
ohh
little gyro
(y+1)(-y+4x) so
(cosx + 1)(-cosx + 4sinx) = 0
cosx = -1 so x = 180
4sinx - cosx...
wait how does 4sinx - cosx = 0
sharp abyss
cuz like when u factorise quadratics you say that both brackets can be equal to 0
so ud have cosx + 1 = 0 or -cosx + 4sinx = 0
little gyro
oh yeah