Trigonometry and Calculus Calculators

Sine, Cosine and Tangent Values, Unit Circle, Function Grapher and Derivative Calculator

Work out sine, cosine and tangent with exact values for the special angles, drag a point round the unit circle, plot up to three functions on one graph, add up a series, differentiate a function with every rule shown and find the area under a curve between two limits.

Every Trigonometry and Calculus tool

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Arithmetic Sequence Calculator

The nth term, the sum and the rule, with the working.

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Definite Integral Calculator

The integral between two limits, the area and the average value.

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Derivative Calculator

Derivatives with the rules shown, plus the tangent at a point.

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Function Grapher

Graph up to three functions with roots and turning points marked.

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Geometric Sequence Calculator

The nth term, the sum and the infinite sum, with the working.

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Interactive Unit Circle

Drag the angle and see sin, cos and tan as lengths.

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Summation Calculator

Sigma notation sums with the terms written out.

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Trig Calculator

All six trig functions and their inverses, with exact values.

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Degrees To Radians

Convert degrees to radians: multiply by π/180.

Exact answers where they exist

Sin 30° is exactly 1/2 and cos 45° is exactly √2/2. The trig tools give these exact forms beside the decimal, and the derivative calculator works symbolically, so the answer is a formula such as 2x · cos(x²) rather than a single number.

Seeing the maths

The unit circle and the grapher draw what the numbers mean. Drag the angle and watch the sine and cosine change; type a function and see its roots, turning points and where it crosses the y-axis. Seeing the shape first makes the formulas far easier to remember.