Trigonometry Calculator
Sine, cosine, tangent and their reciprocals for any angle in degrees or radians — with the unit circle drawn live and exact values for special angles.
Example values are shown — change any of them and the answer updates live.
°
Sine
1/2
sin(30°)
cos√3/2
tan√3/3
csc / sec / cot2 / 1.154701 / 1.732051
Exact values for special angles; rounded to 6 decimals otherwise. tan/csc/sec/cot are undefined at their asymptotes.
Complementary angles
Your angle
sin = 1/2
30°
90° − angle
cos = 1/2
60°
= — see it on the circle.
sin(θ) = cos(90° − θ)
Sine
Step 1 · Sine
sin = opposite ÷ hypotenuse
30°
1/2
Step 2 · cos
cos = adjacent ÷ hypotenuse
30°
√3/2
Exact arithmetic — computed instantly in your browser.