s = ∫ a b 1 + [ f ′ ( x ) ] 2 d x {\displaystyle s=\int _{a}^{b}{\sqrt {1+\left[f'(x)\right]^{2}}}\,dx} ∫ u d v = u v − ∫ v d u {\displaystyle \int \!u\,dv=uv-\int \!v\,du} sin 2 x = 1 − cos 2 x 2 {\displaystyle \sin ^{2}x={\frac {1-\cos 2x}{2}}} cos 2 x = 1 + cos 2 x 2 {\displaystyle \cos ^{2}x={\frac {1+\cos 2x}{2}}} 0 0 , ∞ ∞ , 0 ⋅ ∞ , 1 ∞ , ∞ 0 , 0 0 , ∞ − ∞ {\displaystyle {\frac {0}{0}}~,~{\frac {\infty }{\infty }}~,~0\cdot \infty ~,~1^{\infty }~,~{\infty }^{0}~,~0^{0}~,~\infty -\infty } d y d x = d y d t d x d t {\displaystyle {\frac {dy}{dx}}={\frac {\tfrac {dy}{dt}}{\tfrac {dx}{dt}}}} d 2 y d x 2 = d d t [ d y d x ] d x d t {\displaystyle {\frac {d^{2}y}{dx^{2}}}={\frac {{\frac {d}{dt}}\!\!\left[{\frac {dy}{dx}}\right]}{\frac {dx}{dt}}}} s = ∫ a b ( d x d t ) 2 + ( d y d t ) 2 d t {\displaystyle s=\int _{a}^{b}\!{\sqrt {\left({\tfrac {dx}{dt}}\right)^{2}+\left({\tfrac {dy}{dt}}\right)^{2}}}\,dt} x = r cos θ y = r sin θ {\displaystyle {\begin{array}{rcl}x\!\!\!&=&\!\!\!r\cos \theta \\y\!\!\!&=&\!\!\!r\sin \theta \\\end{array}}} tan θ = y x {\displaystyle \tan \theta ={\frac {y}{x}}} r 2 = x 2 + y 2 {\displaystyle r^{2}=x^{2}+y^{2}\!} tan θ = y x r 2 = x 2 + y 2 {\displaystyle {\begin{array}{lcl}~\!\!\!\!\!&~&\tan \theta ={\dfrac {y}{x}}\\~\!\!\!\!\!&~&~~~\\~\!\!\!\!\!&~&r^{2}=x^{2}+y^{2}\\\end{array}}} tan θ = y x r 2 = x 2 + y 2 {\displaystyle {\begin{array}{lcl}~\!\!\!\!\!&~&\tan \theta ={\frac {y}{x}}\\~\!\!\!\!\!&~&r^{2}=x^{2}+y^{2}\\\end{array}}}
tan θ = y x r 2 = x 2 + y 2 {\displaystyle {\begin{array}{lcl}~\!\!\!\!\!&~&\tan \theta ={\dfrac {y}{x}}\\~\!\!\!\!\!&~&r^{2}=x^{2}+y^{2}\\\end{array}}} x = r cos θ y = r sin θ tan θ = y x r 2 = x 2 + y 2 {\displaystyle {\begin{array}{lcl}x=r\cos \theta \\y=r\sin \theta \\\tan \theta ={\dfrac {y}{x}}\\r^{2}=x^{2}+y^{2}\\\end{array}}}
d y d x = d y d θ d x d θ = f ′ ( θ ) sin θ + f ( θ ) cos θ f ′ ( θ ) cos θ − f ( θ ) sin θ {\displaystyle {\frac {dy}{dx}}={\frac {\tfrac {dy}{d\theta }}{\tfrac {dx}{d\theta }}}={\frac {f'(\theta )\sin \theta +f(\theta )\cos \theta }{f'(\theta )\cos \theta -f(\theta )\sin \theta }}} A = 1 2 ∫ α β [ f ( θ ) ] 2 d θ {\displaystyle A={\frac {1}{2}}\int _{\alpha }^{\beta }\left[f(\theta )\right]^{2}\,d\theta } s = ∫ α β [ f ( θ ) ] 2 + [ f ′ ( θ ) ] 2 d θ {\displaystyle s=\int _{\alpha }^{\beta }\!{\sqrt {\left[f(\theta )\right]^{2}+\left[f'(\theta )\right]^{2}}}\,d\theta }
∑ a n is absolutely convergent if ∑ | a n | converges {\displaystyle {\begin{array}{lcl}\sum a_{n}{\text{ is absolutely convergent if}}\\~~\sum \left|a_{n}\right|{\text{ converges}}\\\end{array}}}
∑ a n is conditionally convergent if ∑ a n converges but ∑ | a n | diverges {\displaystyle {\begin{array}{lcl}\sum a_{n}{\text{ is conditionally convergent if}}\\~~\sum a_{n}{\text{ converges but }}\sum \left|a_{n}\right|{\text{ diverges}}\\\end{array}}}
∑ a n is conditionally convergent if ∑ a n converges but ∑ | a n | diverges {\displaystyle \sum a_{n}{\text{ is conditionally convergent if }}\sum a_{n}{\text{ converges but }}\sum \left|a_{n}\right|{\text{ diverges}}} f ( x ) = ∑ n = 0 ∞ f ( n ) ( c ) n ! ( x − c ) n = f ( c ) + f ′ ( c ) ( x − c ) + ⋯ + f ( n ) ( c ) n ! ( x − c ) n + ⋯ {\displaystyle f(x)=\sum _{n=0}^{\infty }{\frac {f^{\left(n\right)}(c)}{n!}}\,(x-c)^{n}=f(c)+f'(c)(x-c)+\cdots +{\frac {f^{(n)}(c)}{n!}}\,(x-c)^{n}+\cdots } f ( x ) = ∑ n = 0 ∞ f ( n ) ( c ) n ! ( x − c ) n = f ( c ) + f ′ ( c ) ( x − c ) + f ″ ( c ) 2 ! ( x − c ) 2 + f ‴ ( c ) 3 ! ( x − c ) 3 + ⋯ + f ( n ) ( c ) n ! ( x − c ) n + ⋯ {\displaystyle {\begin{array}{lcl}f(x)=\displaystyle \sum _{n=0}^{\infty }{\dfrac {f^{\left(n\right)}(c)}{n!}}\,(x-c)^{n}=f(c)~+\\~~f'(c)(x-c)+{\tfrac {f''(c)}{2!}}\,(x-c)^{2}+{\tfrac {f'''(c)}{3!}}\,(x-c)^{3}\\~~+\cdots +{\tfrac {f^{(n)}(c)}{n!}}\,(x-c)^{n}+\cdots \\\end{array}}}
f ( x ) = ∑ n = 0 ∞ f ( n ) ( c ) n ! ( x − c ) n = f ( c ) + f ′ ( c ) ( x − c ) + ⋯ + f ( n ) ( c ) n ! ( x − c ) n + ⋯ {\displaystyle {\begin{array}{lcl}f(x)=\displaystyle \sum _{n=0}^{\infty }{\dfrac {f^{\left(n\right)}(c)}{n!}}\,(x-c)^{n}\\=f(c)+f'(c)(x-c)+\cdots +{\tfrac {f^{(n)}(c)}{n!}}\,(x-c)^{n}+\cdots \\\end{array}}}
f ( x ) = ∑ n = 0 ∞ f ( n ) ( c ) n ! ( x − c ) n = f ( c ) + f ′ ( c ) ( x − c ) + f ″ ( c ) 2 ! ( x − c ) 2 + f ( 3 ) ( c ) 3 ! ( x − c ) 3 + ⋯ + f ( n ) ( c ) n ! ( x − c ) n + ⋯ {\displaystyle {\begin{array}{lcl}f(x)=\displaystyle \sum _{n=0}^{\infty }{\dfrac {f^{\left(n\right)}(c)}{n!}}\,(x-c)^{n}\\~~=f(c)+f'(c)(x-c)+{\tfrac {f''(c)}{2!}}\,(x-c)^{2}\\~~~+{\tfrac {f^{(3)}(c)}{3!}}\,(x-c)^{3}+\cdots +{\tfrac {f^{(n)}(c)}{n!}}\,(x-c)^{n}+\cdots \\\end{array}}}
![{\displaystyle s=\int _{a}^{b}{\sqrt {1+\left[f'(x)\right]^{2}}}\,dx}](https://wikimedia.org/api/rest_v1/media/math/render/svg/c62d24d3723201855821574aab64eaa4f92f7307)
![{\displaystyle {\frac {d^{2}y}{dx^{2}}}={\frac {{\frac {d}{dt}}\!\!\left[{\frac {dy}{dx}}\right]}{\frac {dx}{dt}}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/7d8476f81ae78704c1cc8efada483f26912c4660)
![{\displaystyle A={\frac {1}{2}}\int _{\alpha }^{\beta }\left[f(\theta )\right]^{2}\,d\theta }](https://wikimedia.org/api/rest_v1/media/math/render/svg/b9d21732463a8fa4c60f3b8ad3e0e4c6817ea463)
![{\displaystyle s=\int _{\alpha }^{\beta }\!{\sqrt {\left[f(\theta )\right]^{2}+\left[f'(\theta )\right]^{2}}}\,d\theta }](https://wikimedia.org/api/rest_v1/media/math/render/svg/60d135af2de80b6c10d12a686590638e488c15a8)
