Trigonometric Functions Calculator f(x)
Evaluate primary trigonometric functions (sine, cosine, tangent) at any degree angle.
f(45°)0.7071
Evaluating f(x)
Trigonometric functions map an angle (x) to a ratio of sides of a right triangle. This tool lets you quickly find the exact or approximate decimal value of f(x) = sin(x), cos(x), or tan(x).
Frequently Asked Questions
Why is tan(90) undefined?
Tangent is defined as sine divided by cosine. At 90 degrees, cosine is exactly 0. Since division by zero is mathematically undefined, the tangent graph has a vertical asymptote at 90 degrees.