Hihi everyone!! WOOO!! One day down and 4 more days to go, 4 more days before the sec 3s' forward track has ended... ...before I start today's post, let me refresh my memory on some A-maths equations!! See if I am remember!
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(Do not read the following if you have not studied trigonometry....under Additional Mathematics haha cause this may demoralise you or maybe may make your brain confuse!! Cause I seriously am confused now and trying to remember all the formulas haha)
cot x = 1/tan x or cos x/sin x
tan x = sin x/cos x
sec x = 1/cos x
cosec x = 1/sin x
(sin x)^2 + (cos x)^2 = 1
1 + (tan x)^2 = (sec x)^2
1 + (cot x)^2 = (cosec x)^2
cos(A+B) = cos A cos B - sin A sin B
cos(A-B) = cos A cos B + sin A sin B
sin(A+B) = sin A cos B + cos A sin B
sin(A-B) = sin A cos B - cos A sin B
tan(A+B) = (tan A + tan B)/(1 - tan A tan B)
tan(A-B) = (tan A - tan B)/(1 + tan A tan B)
sin 2A = 2sin A cos A
cos 2A= 2(cos A)^2 - 1
tan 2A= 2tan A / 1 - (tan A)^2
a cos x + b sin x = square root(a^2 + b^2) cos(x - y)
a cos x - b sin x = square root(a^2 + b^2) cos(x + y)
a sin x + b cos x = square root(a^2 + b^2) sin(x + y)
a sin x - b cos x = square root(a^2 + b^2) sin(x - y)
sin A + sin B = 2 sin(A+B / 2) cos(A-B / 2)
sin A - sin B = 2 cos(A+B / 2) sin(A-B / 2)
cos A + cos B = 2 cos(A+B / 2) cos(A-B / 2)
cos A - cos B = -2 sin(A+B / 2) sin(A-B / 2)
(That is the end, well not exactly but is the end of where I stopped reading of the chapter haha, teacher is just a little bit behind from where I stopped)
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Ok back to my post for today haha! Hmmm hmmm what should I post about? I have absolutely no idea. After trying to remember all those formula, my mind goes blank hehe. Ok never mind haha, I have no idea on what to post about since today is just school and normal lessons and furthermore, only those taking O' levels and the secondary 3s are in school, so boring boring!! All my cute lower secondary students not in school, boooo hoooo!! So basically just going to school to prepare for sec 4 haha.
Well tommorrow got chinese period and will I have 听写? Tommorrow I shall find out haha. Everytime I take 听写, always score so badly de cause firstly my chinese is like sooooo pathetic and secondly, I cannot put in more chinese words into my brain otherwise it would explode haha. Got maths, science, aiyooyoyoyoyo!! My brain is full of stuff, cannot put in so many things. Ok nothing more to say about today and today is really really a very short post to update my blog haha. See ya guys!!