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Mila [183]
3 years ago
5

Write the expression in terms of sine only sin 9x cos 9x

Mathematics
1 answer:
Usimov [2.4K]3 years ago
6 0
\sin 2\alpha= 2\sin \alpha\cos\alpha\quad\Rightarrow\quad\sin 9x\cos 9x=\frac{1}{2}\sin 18x
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