Mathematics, 25.05.2021 07:00 lLavenderl

If A+B=180 then prove that:
2(1-sinA. sinB)=cos²A+cos²B

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If A+B=180 then prove that:
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If A+B=180 then prove that: 2(1-sinA. sinB)=cos²A+cos²B

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If A+B=180 then prove that:
2(1-sinA. sinB)=cos²A+cos²B