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    a) Given that sinx = 5cosx, find the value of tanx
    tanx = 5

    b) Hence, or otherwise, find the values of x in the interval 0 =< x < 360 degrees, for which sinx = 5cosx.
    i have no idea where to begin on this part of the question


    THANK YOU ALL! <3
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    If tanx=5
    Inverse tan to find x=78.69
    then use the cast diagram to find the other values in this range
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    yeah so Tan^-1(5) = x . ± any amounts of  \pi to it and see if it is in the interval.
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    (Original post by samanthaaaa)
    If tanx=5
    Inverse tan to find x=78.69
    then use the cast diagram to find the other values in this range
    a whattttt diagram?

    do you know any websites that can teach me how to use the 'cast diagram'? :O

    would be much appreciated
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    (Original post by dumb maths student)
    a whattttt diagram?

    do you know any websites that can teach me how to use the 'cast diagram'? :O

    would be much appreciated
    Yes, I use examsolutions; it is very helpful although they haven't covered every section of the syllabus.
    For CAST diagrams (also known as quadrant rule) C as in Cos, A as in All, S as in Sin and T as in Tan:
    http://www.examsolutions.co.uk/A-Lev...e/tutorial.php

    This is how I learnt it, this website is amazing
    Hope this helps
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    (Original post by samanthaaaa)
    Yes, I use examsolutions; it is very helpful although they haven't covered every section of the syllabus.
    For CAST diagrams (also known as quadrant rule):
    http://www.examsolutions.co.uk/A-Lev...e/tutorial.php

    This is how I learnt it, this website is amazing
    Hope this helps
    wow thank you SO MUCH! <3
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    (Original post by dumb maths student)
    wow thank you SO MUCH! <3
    No problem
 
 
 
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