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$$$\frac{1}{\sin{\left(x \right)}}$$$의 도함수
관련 계산기: 로그 미분 계산기, 암시적 미분 계산기 (단계별 풀이)
사용자 입력
$$$\frac{d}{dx} \left(\frac{1}{\sin{\left(x \right)}}\right)$$$을(를) 구하시오.
풀이
함수 $$$\frac{1}{\sin{\left(x \right)}}$$$는 두 함수 $$$f{\left(u \right)} = \frac{1}{u}$$$와 $$$g{\left(x \right)} = \sin{\left(x \right)}$$$의 합성함수 $$$f{\left(g{\left(x \right)} \right)}$$$이다.
연쇄법칙 $$$\frac{d}{dx} \left(f{\left(g{\left(x \right)} \right)}\right) = \frac{d}{du} \left(f{\left(u \right)}\right) \frac{d}{dx} \left(g{\left(x \right)}\right)$$$을(를) 적용하십시오:
$${\color{red}\left(\frac{d}{dx} \left(\frac{1}{\sin{\left(x \right)}}\right)\right)} = {\color{red}\left(\frac{d}{du} \left(\frac{1}{u}\right) \frac{d}{dx} \left(\sin{\left(x \right)}\right)\right)}$$거듭제곱법칙 $$$\frac{d}{du} \left(u^{n}\right) = n u^{n - 1}$$$을 $$$n = -1$$$에 적용합니다:
$${\color{red}\left(\frac{d}{du} \left(\frac{1}{u}\right)\right)} \frac{d}{dx} \left(\sin{\left(x \right)}\right) = {\color{red}\left(- \frac{1}{u^{2}}\right)} \frac{d}{dx} \left(\sin{\left(x \right)}\right)$$역치환:
$$- \frac{\frac{d}{dx} \left(\sin{\left(x \right)}\right)}{{\color{red}\left(u\right)}^{2}} = - \frac{\frac{d}{dx} \left(\sin{\left(x \right)}\right)}{{\color{red}\left(\sin{\left(x \right)}\right)}^{2}}$$사인 함수의 도함수는 $$$\frac{d}{dx} \left(\sin{\left(x \right)}\right) = \cos{\left(x \right)}$$$:
$$- \frac{{\color{red}\left(\frac{d}{dx} \left(\sin{\left(x \right)}\right)\right)}}{\sin^{2}{\left(x \right)}} = - \frac{{\color{red}\left(\cos{\left(x \right)}\right)}}{\sin^{2}{\left(x \right)}}$$따라서, $$$\frac{d}{dx} \left(\frac{1}{\sin{\left(x \right)}}\right) = - \frac{\cos{\left(x \right)}}{\sin^{2}{\left(x \right)}}$$$.
정답
$$$\frac{d}{dx} \left(\frac{1}{\sin{\left(x \right)}}\right) = - \frac{\cos{\left(x \right)}}{\sin^{2}{\left(x \right)}}$$$A