Trigonometry
Which of the following cofunctions has the same value as sin(5π8)\sin\left(\frac{5\pi}{8}\right)sin(85π)?
cos(5π8)\cos\left(\frac{5\pi}{8}\right)cos(85π)
cos(−π8)\cos\left(-\frac{\pi}{8}\right)cos(−8π)
cos(3π8)\cos\left(\frac{3\pi}{8}\right)cos(83π)
tan(5π8)\tan\left(\frac{5\pi}{8}\right)tan(85π)