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# C3 Differnetiation/ question watch

1. 4. Find the equation to the tangent to the curve

Give your answer in the form , a and b are constants to be found.

My working:

At

Tangent =

At x = 0, y =

This just didnt seem right...

Thanks
2. 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.

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Updated: December 20, 2010
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