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Deriving trig identities
Nasser M. Abbasi
June 28, 2025
Compiled on June 28, 2025 at 10:07am
1
\(\cos \left ( A+B\right ) \)
and
\(\sin \left ( A+B\right ) \)
2
\(\cos \left ( A-B\right ) \)
and
\(\sin \left ( A-B\right ) \)
3
\(\cos \left ( 2A\right ) \)
and
\(\sin \left ( 2A\right ) \)
4
\(\cos \left ( \frac {x}{2}\right ) \)
5
\(\sin \left ( \frac {x}{2}\right ) \)
6
\(\sin \left ( \alpha \right ) +\sin \left ( \beta \right ) \)
7
\(\cos \left ( \alpha \right ) +\cos \left ( \beta \right ) \)
8
\(\sin \left ( \alpha \right ) -\sin \left ( \beta \right ) \)
9
\(\cos \left ( \alpha \right ) -\cos \left ( \beta \right ) \)
10
\(\cos \left ( A\right ) \cos \left ( B\right ) \)
11
\(\sin \left ( A\right ) \cos \left ( B\right ) \)
12
\(\sin \left ( A\right ) \sin \left ( B\right ) \)