Ex: Sine and Cosine Values Using the Unit Circle - Multiples of pi/4 radians - YouTube
Sin pi/4 - Find Value of Sin pi/4 | Sin π/4
Trigonometry Angles--Pi/4 -- from Wolfram MathWorld
Solved Find the exact trig value for each | Chegg.com
sin(4(x-pi/4))=0
Why is the value of sin 4pi over 3 equal to negative root 3 over 2 - Brainly.com
sin((4pi)/5)
Values of trigonometric functions of arcs pi/6 pi/4 and p/3, The values of the trigonometric functions of arcs that are multipliers of 30 degrees (pi/6) and 45 degrees (pi/4