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# C4 parametric equation

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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
2. bp
3. (Original post by David_Skiller)

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
At that point, y is maximum (in the region shown) so is maximum. What's the range of the sine function?
4. (Original post by notnek)
At that point, y is maximum (in the region shown) so 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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