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Find (dy )/(dx) if x=a ( t - sin t), y =...

Find `(dy )/(dx)` if `x=a ( t - sin t), y = a (1 - cos t).`

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Therefore, `(dy)/( dx) = (dy)/( dt) // (dx) dt) = (a sin t) /( a ( 1 - cos t) ) = ( sin t) /( (1 - cos t))`
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