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Find (dy)/( dx), if x=a [ cos t + log ( ...

Find `(dy)/( dx)`, if `x=a [ cos t + log ( tan ""t//2)]& y= a sin t`

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The correct Answer is:
`(dy)/( dx) = (dy//dt)/( dx//dt) = ( a cos t)/( ( a cos^(2) t)/( sin t) ) = ( sint )/( cos t) = tan t`
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