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Mathematics, 18.02.2021 17:30 bricksaspares

If a+b+c=90° then prove that
sin²A+sin²B+sin²C= 1-2 sinA sinB sinc​

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If a+b+c=90° then prove that
sin²A+sin²B+sin²C= 1-2 sinA sinB sinc​...
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