Recent content by ahoy hoy

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    How do I differentiate tan^-1[(10000-200x)/(26x^2-2750x+77725)]?

    will do. thanks. = )
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    How do I differentiate tan^-1[(10000-200x)/(26x^2-2750x+77725)]?

    if f(x) = tan^-1[x/a], then f'(x) = [a/(a^2+x^2)] thats the only way i can think of going about it.
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    How do I differentiate tan^-1[(10000-200x)/(26x^2-2750x+77725)]?

    Homework Statement f(x) = tan^-1[(10000-200x)/(26x^2-2750x+77725) need to find f'(x) Homework Equations if f(x) = tan^-1 (x/a), then f'(x) = a/(a^2+ x^2) The Attempt at a Solution ok...the attempt I am willing to do on my own, just needing help to get it in the form of x/a...
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    "Finding theta in Argand Diagrams

    uve got it all figured out. preciate it muchly. that speed one too. which was a popular answer in class. majority rules.
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    "Finding theta in Argand Diagrams

    ye same brain waves cos i came back to same angles as urs. its just this part of question is worth 4 marks, i figured thers more to it than that. ah well.
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    "Finding theta in Argand Diagrams

    Homework Statement If w=costheta + i sintheta and theta is between -pi and pi: Find theta if E O and A are on the same straight line. E is a point on diagram representing w(z3). Homework Equations The Attempt at a Solution Ive found the following: z1 (1+(sqrt3)i) z2...
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    Equilibrium constant reaction problem

    but why...could u relate it to theory?
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    Equilibrium constant reaction problem

    Homework Statement Given the equilibrium, A2(g) + 4C(g) 2AC2(g), K1 = 4.8 It follows that, for the reaction, AC2(g) A2(g) + 2C(g), K2 = X X would be Homework Equations The Attempt at a Solution Since the equation is the inverse, i know to use 1/K1. The mole ratio of...
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    High School Calculating Car Speed: Melbourne to Moe

    nothing. i don't think they expect us to go out of our way and calculate distance between the two well known suburbs. I am ok with settling with the logic of mjsd
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    High School Calculating Car Speed: Melbourne to Moe

    mm i get wat u mean. i think its safe to assume that question is gaylord. thanks heaps.
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    High School Calculating Car Speed: Melbourne to Moe

    im stuck as to how to approach this in a mathematical way.. "a car travels from melbourne to moe at an average speed of 80km/h. what is least number of times the speedometer reads 80km/hr ? Explain". thanks.
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    Solving Complex Number Proof: w^2 + (5/w) - 2 = 0

    Homework Statement w=cos(theta) + isin(theta) where 0<theta<pi if the complex number w^2 + (5/w) -2 is purely imaginary, show that 2cos^2 x + 5 cos (theta) -3=0. Hence, find w. Homework Equations cos^2(theta) + sin^2 (theta) = 1 The Attempt at a Solution im guessing to...
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    Graduate Proof: Complex Number w^2+(5/w)-2=0 is Purely Imaginary

    ahh good call. the complex number w^2 + (5/w) -2 is purely imaginary, doesn't necessarily equate to zero.
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    Graduate Proof: Complex Number w^2+(5/w)-2=0 is Purely Imaginary

    w=cos(theta) + isin(theta) where 0<theta<pi if the complex number w^2 + (5/w) -2 = 0 is purely imaginary, show that 2cos^2 x + 5 cos (theta) -3=0. Hence, find w. any input would be appreciated, thx.