Aiyah....tml gt maths quiz.....zzzzzz
Actually wan to find my frens to do together de but they at Woodland sia, so far and i also dunno how to go to the lib..maybe tml meet them go sch early and do...

Im feeling very pissed off, stress and no mood at all..haizzz
..............whatever lahh

d/dx(sin x)= cos x
d/dx(cos x)= -sin x
d/dx(tan x)= sec square x
d/dx(cot x)= csc square x
d/dx(csc x)= cot x sec x
d/dx(sec x)= tan x sec x