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![A handwritten mathematical proof of the sine half-angle identity, sin(θ/2) = √[1/2(1-cosθ)], shown on a lined notebook page. The proof uses a geometric diagram of a right-angled triangle with an angle bisector and algebraic derivations.](https://p16-lemon8-cross-sign.tiktokcdn-eu.com/tos-useast8-i-3931-tx2/oc31YSAGfBEFgwA2AB217DBqOiiKi6A1QpAIU5~tplv-pyavlv3z7u-shrink:640:0:q50.webp?lk3s=66c60501&source=seo_middle_feed_list&x-expires=1821031200&x-signature=YFBBs3GPTVOLQ2gLgk9VUX9YQAE%3D)
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