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C3 Differnetiation/ question watch
- Thread Starter
- 20-12-2010 21:14
- 20-12-2010 21:20
Once you work out dx/dy, get the reciprocal so you have dy/dx. Then subsitute y = pi/4 for the gradient of the tangent, then use the y-y1 = m(x-x1) formula using the coordinates and gradient to get the equation of the tangent.