Giải phương trình:
$\frac{cos3x} {cos5x} - \frac{cosx} {cos3x}=2sin5x.sinx$
Giải PT: $\frac{cos3x} {cos5x} - \frac{cosx} {cos3x}=2sin5x.sinx$
Started By disonline, 31-12-2012 - 06:53
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