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trigonometric functions+ transforming graphs the formulas.

do i have to remember all of the formulas for trigonometric functions etc, like x^2+y^2=25?? im doing edexcel igcse.
Well, I can only speak from the edexcel gcse - I was taught (and had to know) the equation of a circle, x^2 + y^2 = r^2, basic trig, cosine and sine rule and the graphs but thats pretty much it.
Reply 2
ok, i'd say it's probably the same for igcse. thanks!

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