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Найдите cosα , если sinα = 0,8 и 90° < α <180°.

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Найдите cosα , если sinα = 0,8 и 90° < α <180°....

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Най­ди­те cosα , если sinα = 0,8 и 90° < α <180°.​

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Найдите cosα , если sinα = 0,8 и 90° < α <180°.