Evaluate trigonometric functions — sine, cosine, tangent, and their inverses — in degrees or radians with step-by-step results.
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sin(0°)
Also in Triangles
Trigonometry
The trigonometry calculator evaluates the six standard trigonometric functions — sine, cosine, tangent, cosecant, secant, and cotangent — for any angle in degrees or radians. It also computes inverse functions to find angles from ratio values.
Sine, cosine, and tangent are the three primary trig functions. Cosecant, secant, and cotangent are their reciprocals. Together they describe the relationship between angles and side ratios in right triangles and periodic behaviour on the unit circle.
sin(theta), cos(theta), tan(theta)
Primary functions: sine, cosine, tangent.
csc = 1/sin, sec = 1/cos, cot = 1/tan
Reciprocal functions: cosecant, secant, cotangent.
Angles can be measured in degrees (360 per full turn) or radians (2 pi per full turn). Most scientific work uses radians; everyday applications typically use degrees. This calculator accepts either unit and converts between them.
Frequently asked questions
sin(45) = sqrt(2) / 2, which is approximately 0.7071.
Multiply the degree value by pi / 180. For example, 90 degrees = pi / 2 radians.
It returns the angle whose trig ratio equals a given value. For example, arcsin(0.5) = 30 degrees.
Related
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Compute sin(θ/2), cos(θ/2), and tan(θ/2) using half-angle identities from an input angle in degrees or radians.
