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`If" " alpha " and " beta " satisfy the equation " a cos 2 theta + b sin 2 theta = c " then show that " cos^(2) alpha + cos ^(2)beta =1 + (ac)/(a^(2) + b^(2))`

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The correct Answer is:
`cos^(2) alpha + cos^(2) beta = 1 + (ac)/(a^(2) + b^(2))`
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