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# very basic C2 trig question watch

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1. 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
2. If tanx=5
Inverse tan to find x=78.69
then use the cast diagram to find the other values in this range
3. yeah so Tan^-1(5) = x . ± any amounts of to it and see if it is in the interval.
4. (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
5. (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
6. (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
7. (Original post by dumb maths student)
wow thank you SO MUCH! <3
No problem

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