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How can simplify this expression with Mathematica ?

Sin[1/2*ArcCos[x]]^2

Thank you for your help

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closed as off-topic by Bob Hanlon, m_goldberg, user9660, Sjoerd C. de Vries, MarcoB Dec 28 '15 at 0:14

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Sin[1/2*ArcCos[x]]^2 // TrigReduce

enter image description here

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  • $\begingroup$ Great! Thank you $\endgroup$ – Bendesarts Dec 27 '15 at 14:43
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    $\begingroup$ Alternatively (but not as succinctly), Sin[1/2*ArcCos[x]]^2 // TrigToExp // Simplify $\endgroup$ – Bob Hanlon Dec 27 '15 at 15:26

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