解方程:

sin3x cos2x - sin2x cos3x
n[½(1+cos2x)+½(1-cos2x)]

=sin(3x - 2x)
　　　n

=sinx
    n

=six

=6,,

真係o晒咀...a maths真係好屈機~

文友堂真係好鬼正...

浩強堂都好鬼正...訓教一流~

上左咁多堂...4子去稻香high tea仲正~

稻香好似唔妥我地4個咁......不過吹咩>3<

最後....

呀毛:生日快樂