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Toán Lớp 11: helppppppp 1) sin5x + cos5x = √2 cos13x 2) cos7x – sin5x = √3 ( cos5x – sin7x) 3) sin8x – cos6x = √3 ( sin6x + cos8x )

Home/ Toán Lớp 11: helppppppp 1) sin5x + cos5x = √2 cos13x 2) cos7x – sin5x = √3 ( cos5x – sin7x) 3) sin8x – cos6x = √3 ( sin6x + cos8x )

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