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Can someone help me with this C3 Differentiation/Trig Question?

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    This question is driving me crazy and I can't find any solutions online:

    Find the equation of the normal to the curve x=sin(4y) that passes through the point (0, pi/4). Give your answer in the form y=mx + c, where m and c are constants to be found.

    My main problem is how to make y the subject of the equation. I think I'll be able to do the rest. Thank you so much for your help!
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    (Original post by tictactao)
    This question is driving me crazy and I can't find any solutions online:

    Find the equation of the normal to the curve x=sin(4y) that passes through the point (0, pi/4). Give your answer in the form y=mx + c, where m and c are constants to be found.

    My main problem is how to make y the subject of the equation. I think I'll be able to do the rest. Thank you so much for your help!
    You don't need to make y the subject.

    Find dx/dy then use dy/dx = 1/(dx/dy).

    And you can input the y-coordinate to find the gradient.
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    (Original post by notnek)
    You don't need to make y the subject.

    Find dx/dy then use dy/dx = 1/(dx/dy).

    And you can input the y-coordinate to find the gradient.
    Fab thank you!! Makes so much sense now.
 
 
 
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