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Harrizon [31]
2 years ago
14

QUICK can anyone help me. Big points for right answers.

Mathematics
1 answer:
klemol [59]2 years ago
7 0
No13.
Answer:
Cos(x+x)=cosx*cosx-sinx*sinx
=cos2(x)-sin2(x)
=(cosx+sinx)(cosx-sinx)
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