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# C4 further calculus parametric differentiation help needed! watch

1. 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...
2. (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...
Attachment 512077512079Question 15
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3. Moved to maths.
4. (Original post by AndyOC)
Attachment 512077512079Question 15
Get a common denominator in each bracket, then multiply the numerators and denominators and simplify.
5. 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.
6. (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?
7. (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
8. (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.
9. (Original post by AndyOC)
Attachment 512077512079Question 15
^^take note of asurats post

take this example; but , 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?
10. (Original post by DylanJ42)
^^take note of asurats post

take this example; but , 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?
11. (Original post by AndyOC)
is this correct?
looks good to me nice job
12. (Original post by DylanJ42)
looks good to me nice job
ah yeah i see it now, thank you!
13. thank you everyone!
14. (Original post by AndyOC)
is this correct?
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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