peanotto
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I keep struggling with C3 and C4 theres some topics I just cant get my head around even if I look at video tutorials. The topics i find hardest are:
-C3 functions
-C3 trigonometry
-C4 vectors (i can understand but some of the papers have really hard vector questions)
Can anyone whos doing well in c3 and c4 give me advice please

P.S: also for solving trig questions do you use the CAST diagram or do you draw the actual trig graphs.
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Prasiortle
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(Original post by peanotto)
I keep struggling with C3 and C4 theres some topics I just cant get my head around even if I look at video tutorials. The topics i find hardest are:
-C3 functions
-C3 trigonometry
-C4 vectors (i can understand but some of the papers have really hard vector questions)
Can anyone whos doing well in c3 and c4 give me advice please

P.S: also for solving trig questions do you use the CAST diagram or do you draw the actual trig graphs.
For the topics you listed, try ExamSolutions.net
Regarding the PS: look up "general solutions to trig equations". It's from FP1 but makes this a lot clearer, especially in solving equations where the angle is not just x but e.g. 2x + 30. The basic idea is that e.g. for sin(x) = a, you get two fundamental solutions as sin^-1(a) and 180 - sin^-1(a), and then all other solutions are found by adding or subtracting multiples of 360 degrees to one of these. You can see this by considering the graph - there is reflection symmetry about the line x = 180 (or 540 etc.), and the graph repeats itself every 360 degrees.
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peanotto
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(Original post by Prasiortle)
For the topics you listed, try ExamSolutions.net
Regarding the PS: look up "general solutions to trig equations". It's from FP1 but makes this a lot clearer, especially in solving equations where the angle is not just x but e.g. 2x + 30. The basic idea is that e.g. for sin(x) = a, you get two fundamental solutions as sin^-1(a) and 180 - sin^-1(a), and then all other solutions are found by adding or subtracting multiples of 360 degrees to one of these. You can see this by considering the graph - there is reflection symmetry about the line x = 180 (or 540 etc.), and the graph repeats itself every 360 degrees.
thanks alot man
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