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# C3 Trig

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1. http://filestore.aqa.org.uk/subjects...3-QP-JAN12.PDF

Question 4

i got the answers for a (60, 101.5, 300, 258.5) but can someone just talk me through b? I seem to mess up somehow..
2. let all of your values from a) = 4x-10
then solve for x.

eg. let
4x-10=60
4x=70
x=17.5

Do the same thing for all of your values but make sure to double check the range because some of the answers may not fall within the range and will therefore be invalid.
3. (Original post by GEEKSruletheworld!)
let all of your values from a) = 4x-10
then solve for x.

eg. let
4x-10=60
4x=70
x=17.5

Do the same thing for all of your values but make sure to double check the range because some of the answers may not fall within the range and will therefore be invalid.
Do we not have to do any extra crap like find new values outside the original range then rearrange? i faintly remember doing that for C2 when it was like sin2x rather than just sinx
4. Yes you would
5. (Original post by B.Carmine)
Do we not have to do any extra crap like find new values outside the original range then rearrange? i faintly remember doing that for C2 when it was like sin2x rather than just sinx
Note that 0 < x < 90 implies -10 < 4x-10 < 350, so find values betwen -10 and 350 that solve part (a), then use them to solve for x.

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