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Simplifying this expression (1 Viewer)

Thread starter amdspotter
Start date Dec 2, 2021
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hsc

A

amdspotter

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#1

how would i simplify:
A^2 x (Cos^2alpha+2cosalpha i sin alpha -sin^2 alpha)

Lith_30

o_o

#2

You can use double angle identities. Specifically, $\cos(2\alpha)=\cos^2(\alpha)-\sin^2(\alpha)$ and $\sin(2\alpha)=2\cos(\alpha)\sin(\alpha)$

A

amdspotter

Member

#3

Lith_30 said:
You can use double angle identities. Specifically, $\cos(2\alpha)=\cos^2(\alpha)-\sin^2(\alpha)$ and $\sin(2\alpha)=2\cos(\alpha)\sin(\alpha)$

ah this makes it so clear thanks a lot bro

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