Trigonometry
Which of the following cofunctions has the same value as sin22.5°\sin22.5\degreesin22.5°?
cos22.5°\cos22.5\degreecos22.5°
sin67.5°\sin67.5\degreesin67.5°
tan67.5°\tan67.5\degreetan67.5°
cos67.5°\cos67.5\degreecos67.5°