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Its just: V=pi int. (b--->a) x^2 dy (y-axis revolution) OR/ V=pi int(b--->a) y^2 dx ( x-axis revolution)

All correct cept the last part man, the last part is actually asking for the probability which is my error but the answer is (24+4+4)/24C5=4/5313 #... see if you can get that if not i'll explain, sorry again

Question: A deck of cards consists of a 4 groups each of 6 cards. Each group with a different colour and the cards number 1 to 6. a) How many distinct 5-card subsets are possible from the deck If: i)3 cards are marked with integer '5' and 2 are marked with '6' ii)5 cards are all the same...

Age: 18 Biological Age:20

For other hes just means subtract the distance from wall to origin of projection ie. x=25rt3-225rt3/2=25rt3/2 <DIR></DIR>Well done nevertheless Gurmies!

no worries man Question (Projectile): A golf ball is hit from a point O with an initial velocity V m/s so that it rises with an angle of 30* ( *=degrees) to the horizontal. Taking g=10ms/s show that x=1/2(Vrt(3t)), y=-5t^2+1/2(Vt) a) in its decent, its clears a wall 11.25m high, and takes...

nice work man, EXACTLY how i done it. Got a Q? i could post up another i suppose?

i think im noob, gurmies lol Question: If P(x)=ax^5+bx^4+cx^3+dx^2+ex+f, Write down P(-x)=-P(x). i)If P(x) is an Even polynomial, show that a=c=e=0 ii) If P(x) is an Odd polynomial, show that b=d=f=0 Hence, state general results for the coefficients of odd and even powers of x when a...

i think i might type out these kinda Q using latex now, i never see the denominator, hence use product instead of quotient

int. sin^2xcos^2x int. 1/4(2sinxcosx)^2 1/4 int. sin^2 (2x) [cos4x=1-2sin^2(2x)] 1/8 int. sin^2(2x)=1/8 int. (1-cos4x) 1/8(x-1/4sin4x)+C #

haha yer i suppose, but i mean you summarised it all pretty nicely haha

Re: 回复: Integration and probability nah man, thats def correct EDIT: Ahh shit, its not... sorry all

dx/dy=4x-4 <----- that's supposed to be dy/dx, think of what its saying, change in y with respect to a change in x, since the RHS values are in terms of x this is the correct way of writing it. From here: When dy/dx=0 ( a stationary point occurs) 4x-4=0 4(x-1)=0 [factorising] x-1=0 [dividing...

LHS=mC0+mC1(x)+mC2(x^2)+...+m+3Cr (x^r) RHS=[(1+x)^m=mC0+mC1(x)+mC2(x^2)+...+mCr-3 (x^r-3)+mCr-2(x^r-2)+mCr(x^r-1)+mCr(x^r)]((1+3x^2+3x+x^3) By comparing coefficients of x^r, m+3Cr=mCr+3(mCr-1)+3(mCr-2)+mCr-3 # Edit: Wish i saw your post Tim, i would have never done any of that lol

Re: 回复: Integration and probability 2. sin4xcos4x= 1/2(sin8x) 2sin2xcos2x=sin4x lol i'll do the rest later if no one else has

Let u=sinx, du/dx=cosx du=cosx dx therefore int. (u)(du) u^2/2= sin^2x/2+C I just done this method for the purpose of showing you, i would have done it Jet black's method.

umm...yer? what's your point? Put 7^1.841564442 into your calculator and tell me what you get

dude... i obviously knew that i skipped a few steps, i was just trying to outsmart your Q, dw...

hahaha you know that i know your great ability at maths man, im just joking.

haha aw alex... you can think of some very efficent and clean methods...this wasn't one of them man lol