$\frac{1+\cos\left(2x\right)}{\sin\left(2x\right)}=\cot\left(x\right)$

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Proof the identity: sin(2x) = 2sin(x)cos(x)

https://www.youtube.com/watch?v=hAuRha-Y8Mg

Another substitution with x=sin (theta)

https://www.youtube.com/watch?v=8Yl_u_Otcjg

Tutorial - Solving logarithmic equations ex 10, log(2x)+log(x-5)=2

https://www.youtube.com/watch?v=fzjoQXBd0uU

79. Límite trigonométrico con senos y cosenos: x sen x entre 1 - cos 2x | Límite

https://www.youtube.com/watch?v=dwSHXaDOzv8

Calculus - How to use the chain rule with trigonometric functions, g(x) = sin(x^2)

https://www.youtube.com/watch?v=VyJXnKjRcjk

Integral de 2 sen 2x sec x, usando identidades trigonométricas

https://www.youtube.com/watch?v=MxdnJV9qtYI

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