The value of sin^4 π/8 + sin^4 3π/8 + sin^4 5π/8 + sin^4 7π/8 is - Sarthaks eConnect | Largest Online Education Community
Evaluate \sin\frac{\pi}{4} | Homework.Study.com
Sin 4pi/3 - Find Value of Sin 4pi/3 | Sin 4π/3
Learn how to find the sine of 5 pi over 4 without a calculator - YouTube
Need help understanding why the answer is pi. I don't understand the first line at all and I don't understand how they got rid of the sin(4pi) / 4 in the last