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C4 parametric equation

http://pdf.ocr.org.uk/download/pp_08_jun/ocr_30882_pp_08_jun_l_gce_4724.pdf?

Q9A

How am I supposed to find the co-ordinate of A? I know how to find B, but unsure how to find A.

Thanks :smile:
Reply 1
Avatar for David_Skiller
David_Skiller
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bp
Reply 2
Avatar for Notnek
Notnek
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Original post by David_Skiller
http://pdf.ocr.org.uk/download/pp_08_jun/ocr_30882_pp_08_jun_l_gce_4724.pdf?

Q9A

How am I supposed to find the co-ordinate of A? I know how to find B, but unsure how to find A.

Thanks :smile:

At that point, y is maximum (in the region shown) so 4sin⁡θ4\sin\theta is maximum. What's the range of the sine function?
Reply 3
Avatar for David_Skiller
David_Skiller
OP
Original post by notnek
At that point, y is maximum (in the region shown) so 4sin⁡θ4\sin\theta is maximum. What's the range of the sine function?


Brilliant, thanks. I understood it was a maximum, but then tried differentiating lol, thank you.

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