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My goddamn graphic calculator (Casio 9860G) has gone insane. It will not give me correct graphs. I'll give you an example. I gave an IGCSE maths exam where I had to divide x by root of (x^2+4)(X^2+1) I'm pretty sure my graph was correct as everyone else got the same thing- but now its showing me...

Guys I gave IGCSE math p6 and i'm not sure about some answers- since we can legally discuss the paper now, can someone tell me it they gave the paper, i'm not sure about 2 answers and i really want to know how i've fared.

Did anyone get the b part of the circle geometry section where they asked us to find the value of R??? Please, quickly, I'm freaking out :/ And also, the part where we had to find the radius of the mug?????? :O