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OpenStudy (joannablackwelder):
show that the normal line at any point on the circle x^2+y^2=r^2 passes through the origin
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OpenStudy (joannablackwelder):
@freckles
OpenStudy (freckles):
have you found y'
OpenStudy (joannablackwelder):
Yeah, it is -x/y
imqwerty (imqwerty):
this is a circle with the origin at center so any line tangent makes an angle of 90 with centr|dw:1443674243272:dw|
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