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Find the equation of the normal at the s...

Find the equation of the normal at the specified point to each of the following curves
`x= a( 2 cos t+ cos 2t), y= a (2 sin t- sin 2t)` at `t=(pi)/(2)`

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The correct Answer is:
`x-y+3a=0`
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CHHAYA PUBLICATION-TANGENT AND NORMAL -VERY SHORT ANSWER TYPE QUESTIONS
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