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The length of the tangent to the curve y...

The length of the tangent to the curve `y=f(x)` is equal to:
A) `ysqrt(1+(y1)^2)`
B)`(y/(y1))sqrt(1+(y1)^2)`
C) `((y1)/y)sqrt(1+(y1)^2)`
D) `y1sqrt(1+(y1)^2)`

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