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Toán Lớp 9: Cho a = `25^o`, b = `65^o` thì A : sin a = sin b B : sin a = cos b C : tan a = sin b D : cot a = cos b

Home/ Toán Lớp 9: Cho a = `25^o`, b = `65^o` thì A : sin a = sin b B : sin a = cos b C : tan a = sin b D : cot a = cos b

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