✓ Effortless Math · Free Tool

Tangent Line Calculator

Find the equation of the line tangent to a function at a point — with the slope (derivative), the point of tangency, a graph, and step-by-step working.

y − f(a) = f′(a)·(x − a)
f(x) at x = a

Use x as the variable. Functions: sin, cos, tan, exp, ln, log, sqrt, abs.

Results

Tangent line
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Point of tangency
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Slope f′(a)
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y-intercept
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Graph

f(x)tangent linepoint

Step-by-step