N- n-2 xthen cos n-2cos-2-

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Domain and Range of Trigonometric Ratios

n+α+ n-α=2 xt...

Question

$sec (n + α) + sec (n - α) = 2 sec x$
then $cos n = \pm \sqrt{2} cos \frac{α}{2}$ .

True

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False

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