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(Solved): how this is equal to -sini plz show all basics =2(cos(2+2i)cos(2))=2(cos(2+i ...

$\( \begin{array}{l}=-2\left(\cos \left(\frac{\pi+2 i}{2}\right)-\cos \left(\frac{\pi}{2}\right)\right) \\ =-2\left(\cos \left$

how this is equal to -sini plz show all basics

= ? 2 (cos (\frac{? + 2 i}{2}) ? cos (\frac{?}{2})) = ? 2 (cos (\frac{?}{2} + i) ? cos (\frac{?}{2})) = ? 2 (? sin i)

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