Sum
If y =1 - cos θ , x = 1 - sin θ , then ` dy/dx at " "θ =pi/4` is ________
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Solution
`dy/dx=sintheta`
`(dx)/(d theta)=-cos theta`
`dy/dx=((dy)/(d theta))/((dx)/(d theta))=-sintheta/costheta=-tan theta`
`dy/dx = - tan (pi/4)`
`therefore dy/dx=-1`
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