∫ 1 t π f ( x ) 2 d x = ( 1 / 6 ) π [ ( 1 + 3 t ) 2 − 16 ] {\displaystyle \int _{1}^{t}\pi f(x)^{2}dx=(1/6)\pi [(1+3t)^{2}-16]}
∫ 1 t f ( x ) 2 d x = ( 1 / 6 ) [ ( 1 + 3 t ) 2 − 16 ] {\displaystyle \int _{1}^{t}f(x)^{2}dx=(1/6)[(1+3t)^{2}-16]}
Let g ( x ) = f ( x ) 2 {\displaystyle g(x)=f(x)^{2}} and let G ( x ) = {\displaystyle G(x)=} an antiderivative of g ( x ) {\displaystyle g(x)} . Then:
∫ 1 t g ( x ) d x = ( 1 / 6 ) [ ( 1 + 3 t ) 2 − 16 ] {\displaystyle \int _{1}^{t}g(x)dx=(1/6)[(1+3t)^{2}-16]}
G ( t ) − G ( 1 ) = ( 1 / 6 ) [ ( 1 + 3 t ) 2 − 16 ] {\displaystyle G(t)-G(1)=(1/6)[(1+3t)^{2}-16]}
G ( t ) = ( 1 / 6 ) [ ( 1 + 3 t ) 2 − 16 ] + G ( 1 ) {\displaystyle G(t)=(1/6)[(1+3t)^{2}-16]+G(1)}
d d t G ( t ) = d d t ( ( 1 / 6 ) [ ( 1 + 3 t ) 2 − 16 ] + G ( 1 ) ) {\displaystyle {\frac {d}{dt}}G(t)={\frac {d}{dt}}((1/6)[(1+3t)^{2}-16]+G(1))}
d d t G ( t ) = ( 1 / 6 ) d d t [ ( 1 + 3 t ) 2 ] {\displaystyle {\frac {d}{dt}}G(t)=(1/6){\frac {d}{dt}}[(1+3t)^{2}]}
d d t G ( t ) = ( 1 / 6 ) d d t [ 1 + 6 t + 9 t 2 ] {\displaystyle {\frac {d}{dt}}G(t)=(1/6){\frac {d}{dt}}[1+6t+9t^{2}]}
d d t G ( t ) = ( 1 / 6 ) [ 6 + 18 t ] {\displaystyle {\frac {d}{dt}}G(t)=(1/6)[6+18t]}
d d t G ( t ) = 1 + 3 t {\displaystyle {\frac {d}{dt}}G(t)=1+3t}
g ( t ) = 1 + 3 t {\displaystyle g(t)=1+3t}
Plugging back in,
g ( x ) = f ( x ) 2 {\displaystyle g(x)=f(x)^{2}}
1 + 3 x = f ( x ) 2 {\displaystyle 1+3x=f(x)^{2}}
f ( x ) = 1 + 3 x {\displaystyle f(x)={\sqrt {1+3x}}}
m a r i l y n = m a r i l y n − 1 + m a r i l y n − 2 {\displaystyle marily_{n}=marily_{n-1}+marily_{n-2}}
2 {\displaystyle {\sqrt {2}}}
Σ i = 1 ∞ 10 − ( i ! ) {\displaystyle \Sigma _{i=1}^{\infty }10^{-(i!)}}
¬ ∃ x ∃ L ∃ a > 0 ∀ ϵ ∈ ( 0 , a ) ∃ δ | l o v e f o r y o u ( x + δ ) − L | < ϵ {\displaystyle \neg \exists x\ \exists L\ \exists \ a>0\ \forall \ \epsilon \in (0,a)\ \exists \ \delta \ |love\ for\ you\ (x+\delta )-L|<\epsilon }
d d x ∫ f ( x ) d x = f ( x ) {\displaystyle {\frac {d}{dx}}\int f(x)dx=f(x)}