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[解三角形]降幂升角余弦定理配方求三角形面积
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App02:49![[解三角形]降幂升角余弦定理配方求三角形面积](http://p3-sign.bdxiguaimg.com/tos-cn-i-0004/17554d48ecbe4c8c93fc5553c23ef6ce~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&biz_tag=list_custom%2Fnone&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202502030827224F6ED040CA9CAA413DDE&requestFrom=704&version_code=80402&x-expires=1770078442&x-signature=hWxBvgH1TeOOdItmMzofxv9N4vk%3D)
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App02:26![[解三角形]凑齐次式正弦定理辅助角公式求范围](http://p3-sign.bdxiguaimg.com/tos-cn-i-0004/e6d63f08c1c64f3180852244833f8d55~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&biz_tag=list_custom%2Fnone&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202502030827224F6ED040CA9CAA413DDE&requestFrom=704&version_code=80402&x-expires=1770078442&x-signature=kKqvg8UTx7i55fP8DPYoLQAhhTU%3D)
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App03:32![[解三角形]余弦定理面积公式公共变量单调性证明不等式](http://p26-sign.bdxiguaimg.com/tos-cn-i-0004/6de08e4995224907a7845207d62a1966~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&biz_tag=list_custom%2Fnone&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202502030827224F6ED040CA9CAA413DDE&requestFrom=704&version_code=80402&x-expires=1770078442&x-signature=X6QsaB%2FrO9Zg1FTMlIzkV7EPSGk%3D)
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