DDesmos SAT Prep
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Special Angles & Exact Trig Values

Get exact sine, cosine, and tangent values without the unit circle.

The Desmos trick

Toggle Desmos into degree mode and type the trig expression directly — no unit circle memorization needed. Compare the decimal Desmos gives you against common exact forms like √2/2 or √3/2 to confirm the exact value asked for.

  • Click the wrench/settings icon to switch between Degrees and Radians before evaluating anything
  • In degree mode, type sin(30) directly to get 0.5 instantly
  • In radian mode, pi is recognized automatically: type cos(pi/3)

Practice questions

Q1In degree mode, what is sin(30°)?
Easy
Q2In radian mode, what is cos(π/3)?
Easy
Q3In degree mode, what is tan(45°)?
Medium
Q4What is the exact value of sin(60°)?
Medium
Q5If sin(θ) = √2/2 and 0° < θ < 90°, what is θ in degrees?
Hard