Answer
$$tan\cdot2u+cot(2u)^2=4cotu^2+2antu$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}tan\cdot2u+cot(2u)^2& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}tan\cdot2u+cot\cdot4u^2 \xlongequal{ } \\[1 em] & \xlongequal{ }2antu+4cotu^2 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}4cotu^2+2antu\end{aligned} $$ | |
| ① | $$ \left( 2u \right)^2 = 2^2u^2 = 4u^2 $$ |
| ② | Combine like terms: $$ 4cotu^2+2antu = 4cotu^2+2antu $$ |
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