Toán Lớp 11: 1) 25sin²x + 15sin2x + 9 cos²x = 25
2) sin4x . sin3x = cosx
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Toán Lớp 11: 1) 25sin²x + 15sin2x + 9 cos²x = 25
2) sin4x . sin3x = cosx
Giúp mình với ạ, mình cảm ơn ạ.
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