How it works ?
Without using a calculator, use this applet to test your knowledge of evaluating trigonometric functions of special angles.
Every angle you see will be a multiple of pi/6 and/or pi/4 radians. Angle range tested here = [-12pi, 12pi].
Be sure to input EXACT VALUES of RATIOS in the input box! Use the phrase “sqrt()” for the square root symbol. For example, type “sqrt(3)/2” for sqrt(3)/2