39.
삼각파의 최대치가 1일 때 ㉠실효치와 ㉡평균치는?
①
㉠ \(\frac{1}{\sqrt{2}}\), ㉡ \(\frac{2}{\pi}\)
②
㉠ \(\frac{1}{2}\), ㉡ \(\frac{\pi}{2}\)
③
㉠ \(\frac{1}{\sqrt{2}}\), ㉡ \(\frac{1}{2\sqrt{2}}\)
④
㉠ \(\frac{1}{\sqrt{3}}\), ㉡ \(\frac{1}{2}\)