# Lesson: Euler’s Formula for Trigonometric Identities

Mathematics

In this lesson, we will learn how to use Euler’s formula to prove trigonometric identities like double angle and half angle.

16:59
{"ft_lang_label":"__label__en","ft_lang_prob":0.6529689,"math_prob":0.5294339,"size":249,"snap":"2020-24-2020-29","text_gpt3_token_len":63,"char_repetition_ratio":0.114285715,"word_repetition_ratio":0.0,"special_character_ratio":0.23293173,"punctuation_ratio":0.13043478,"nsfw_num_words":0,"has_unicode_error":false,"math_prob_llama3":0.9775941,"pos_list":[0],"im_url_duplicate_count":[null],"WARC_HEADER":"{\"WARC-Type\":\"response\",\"WARC-Date\":\"2020-07-08T23:20:53Z\",\"WARC-Record-ID\":\"<urn:uuid:d0a8ded9-85c3-45d7-bf0f-a947f2d2fe55>\",\"Content-Length\":\"37193\",\"Content-Type\":\"application/http; msgtype=response\",\"WARC-Warcinfo-ID\":\"<urn:uuid:86fb52f8-874f-46f3-8d0b-87db9f16423b>\",\"WARC-Concurrent-To\":\"<urn:uuid:e0a8cbfc-434f-4f31-bad7-0d965dcfe841>\",\"WARC-IP-Address\":\"34.196.176.227\",\"WARC-Target-URI\":\"https://www.nagwa.com/en/lessons/838107462676/\",\"WARC-Payload-Digest\":\"sha1:ZYAKBBNIBNASJ7UFOXKTODFQU4K3RAJC\",\"WARC-Block-Digest\":\"sha1:HYI3H6NLOPEGE3WPBVGQ5QNJ7YZPYEZC\",\"WARC-Identified-Payload-Type\":\"text/html\",\"warc_filename\":\"/cc_download/warc_2020/CC-MAIN-2020-29/CC-MAIN-2020-29_segments_1593655897707.23_warc_CC-MAIN-20200708211828-20200709001828-00194.warc.gz\"}"}