BenjaminE
Write an expression for the point P. [PIC]
The picture is sadly enough incomplete, but lets say r=1 as in the unit circle.



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BenjaminE
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Here it is.

vf321
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I'll keep r symbolic. If the line that leads from the xaxis to point P is perpendicular to the xaxis, what is p's xvalue?

BenjaminE
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aha, r. But what about y.

vf321
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Well, I'd suggest removing the circle from your drawing and keeping v and your new x value.

vf321
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What does it look like? (Use the 'Draw' feature under the reply box)

BenjaminE
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dw:1345848002791:dw
tan v = y/r
r tan v = y
P = ( r, r tan v) ?

vf321
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Right

BenjaminE
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Thank you!

vf321
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YW. Don't forget to close the question.