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Function: driver
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Function: driver
File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Cacher.php
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Function: initiateCache
File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/controllers/ver3/Contents.php
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File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
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File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
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Function: model
File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
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Line: 559
Function: get_footer
File: /volume1/web/PhpstormProjects/www_polymath_co_kr/index.php
Line: 315
Function: require_once
수학동아 - 폴리매스
함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
디듀우
2019.11.18 21:18
조회 566
모든 임의의 실수 x에 대해 -1<=f(x)<=1, -1<=g(x)<=1인 함수 f(x)와 g(x)에 관한 몇 가지 조건이 있다. 이들이 각각 sin함수와 cos함수임을 증명하려면 최소한 몇 가지의 조건으로 무엇이 필요한가?
A. f(x-pi)=g(x)
B. f'(x)=g(x), g'(x)=-f(x)
C. -f(-x)=f(x), g(-x)=g(x)
D. f(x+2pi)=f(x), g(x+2pi)=g(x)
E. {f(x)}^2+{g(x)}^2=1
지금 바로
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