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C4 further calculus parametric differentiation help needed! Watch

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    about to upload my question now... think what i've done up to is correct just dont know where to go from where i am...
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    (Original post by AndyOC)
    about to upload my question now... think what i've done up to is correct just dont know where to go from where i am...
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    Moved to maths.
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    (Original post by AndyOC)
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    Get a common denominator in each bracket, then multiply the numerators and denominators and simplify.
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    If your second bracket is supposed to be dt/dx it's incorrect, you can't just flip the two fractions like that and get the correct result.
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    (Original post by Asurat)
    If your second bracket is supposed to be dt/dx it's incorrect, you can't just flip the two fractions like that and get the correct result.
    how should it be written?
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    (Original post by AndyOC)
    how should it be written?
    Common denominator then flip.

    Try doing 1/(1/2 + 1/2) and see what happens if you don't simplify. Your way gets you 2 + 2

    The proper way gets you 1
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    (Original post by AndyOC)
    how should it be written?
    I'd personally make the two fractions a single fraction with a common denominator and then inverse afterwards, so have a go at that.
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    (Original post by AndyOC)
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    ^^take note of asurats post

    take this example;  \displaystyle x = 3 + 2 but  \displaystyle \frac{1}{x} \neq \frac{1}{3} + \frac{1}{2} , notice how you cant just flip both fractions like that


    so score out the last line and get dx/dt and dy/dt both as a single fraction with a common denominator. btw your writing is really nice

    PS aren't you a fan of the quotient rule?
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    (Original post by DylanJ42)
    ^^take note of asurats post

    take this example;  \displaystyle x = 3 + 2 but  \displaystyle \frac{1}{x} \neq \frac{1}{3} + \frac{1}{2} , notice how you cant just flip both fractions like that


    so score out the last line and get dx/dt and dy/dt both as a single fraction with a common denominator. btw your writing is really nice

    PS aren't you a fan of the quotient rule?
    is this correct?
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    (Original post by AndyOC)
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    looks good to me nice job
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    (Original post by DylanJ42)
    looks good to me nice job
    ah yeah i see it now, thank you!
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    thank you everyone!
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    (Original post by AndyOC)
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    You're supposed to remove the (1+t)^2 in the denominator

    EDIT: opps, forget what I said. Thought that bottom answer was dy/dx and not dy/dt
 
 
 
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