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Find the equations of tangent and normal...

Find the equations of tangent and normal to curve `x = 1 - cos theta and y = theta - sin theta "at" theta = (pi)/(4)`.

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The correct Answer is:
`y - (sqrt(2) - 1)x = (pi)/(4) - (4)/(sqrt(2)) + 2, y + (sqrt(2) + 1) x = (pi)/(4)`
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