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i dont get how d(x+y)/[dx.d(x+y)] changes to 1 + dy /dx in your method d/dx(x+y) = 1 + dy / dx, but how does the d(x+y) disappear

Find dy/dx in terms of x and y by differentiating implicitly sin(x+y) = cos(x-y) whats a short way of doing this question

to decode hamlet try no fear shakespeare. However, it's your interpretation after all.

In the light zone, there is enough light for photosynthesis to take place, so many plants and other photosynthetic organisms live in this zone and food is abundant. Photosynthesis is a process in which sunlight and carbon dioxide gas are converted into food (chemical energy contained in...

flame tests are only used for cations. Maybe solubility rules? Lead sulfate will form precipitate. Dno any other tests. are you supposed to know?

check hsc books or google..simplest way

there is a good explanation of natural selection (for peppered moth) in the bio dot point book.

haploid gametes are produced after the division process http://www.le.ac.uk/ge/genie/vgec/images/meiosis_II_males.png

oh jeesus thought it said pass through x y axes

just go do challenge questions in maths in focus, cambridge or the sort

why am i in the english forum :O sifness im going to read that in full form lol probably wont even read it even if you condensed it. Just copy off your friend, since it is already due 2 days ago

what it is useful is common sense. in engineering, which you can apply here, you find the factor of safety (range) which something works in so it doesnt fail.

there are two such circles because if the circle equation passes through (1,2) it could be facing upwards or downwards (one is concaving down and one is concaving up). I haven't worked it out yet (in school :P) but i did x^2 +y^2 = r^2, sub in points; r = root 5. But since centre is not at...

Approximate the difference between cosx and 1 - .5x^2 for small angles, and find the smallest angle, in degrees, for which this difference exceeds 0.001. DO NOT USE CALCULATOR i.e. show it EXTRA INFO :: cos x .=. 1 - .5x^2 Trebla plox :p

the reason for horizontal tangent at (4,-1) is because thats the parabola's vertex. If it didnt specify the point (4,-1) then normal could be all real x i believe (for normal to y = -1). But in this case its x = 4

f(x)= x^2 - 8x + 15\\ f'(x)= 2x - 8\\ At P(4,-1)\\ f'(4) = 0\\ y+1 = 0\\ y = -1\ first\ equation\\ m1m2 = -1\\ 0.m2 = -1\\ m2 = -1/0\\ If\ substitution\ into\ that\ formula\ gives\ a\ zero\ denominator\, then\\ m1m2 = -1\ and\ the\ lines\ are\ perpendicular normal should be all real x, i think...

f(x)=\frac {x^2 + x + 3}{x^2}\\ =\lim_{x\to -\infty}\frac {x^2 + x + 3}{x^2}\\ =\lim_{x\to -\infty}x + \frac{1}{x} + \frac {3}{x^2}\\ =1^- \ \ \ since\ others\ are\ limited\ to\ -0.00000000001\\ hence\ the\ value\ is\ 0.9999999999999 farr explotable your gif is laggy as hell lol give me...

hey this is a link for the makeitso comp, post your link here and we'll spread the rating. Everyone reps everyone, everyone wins. Thank you *go on http://makeitso.org.au/explore-ideas/list/ *then type gravity in search *and rate "gravitational devices can defy gravity within a sphere of...

i got a exact value question now find exact value of tan (pi / 8) using 1-cos2x / 1+cos2x = tan^2 x i got the answer but i dont know how to get it into a simpler form, help ^^ root2 - 1 is the answer i got root (3-2root 2) yes i know its just a subbing in question, just dont know what...

the question before it was find exact value i was watching a movie while doing this so looked up and down and didnt read question :D