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For 0 less-than x less-than StartFraction pi Over 2 EndFraction, which expression is equivalent to StartStartFraction sine (StartFraction x over 2 EndFraction) tangent (StartFraction x Over 2 EndFraction) OverOver 1 minus cosine (x) EndEndFraction?

StartFraction 1 Over StartRoot 2 (1 + cosine x) EndRoot EndFraction
StartFraction 1 Over StartRoot 2 (1 minus cosine x) EndRoot EndFraction
(StartRoot StartFraction 1 + cosine (x) Over 2 EndFraction EndRoot) (StartFraction 1 Over 1 minus cosine (x) EndFraction)
(StartFraction 1 + cosine (x) Over StartRoot 2 (1 minus cosine x) EndRoot EndFraction) (StartFraction 1 Over 1 minus cosine (x) EndFraction)



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