Math, asked by williamkandulana, 4 days ago

If sec(A+B)+ sec (A-B)=2 sec A then show that cosA =
$\sqrt{2} cos \: a \div 2$

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Answered by laljibhai525

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If sec(A+B)+ sec (A-B)=2 sec A then show that cosA =
$\sqrt{2} cos \: a \div 2$