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KariSa11
@KariSa11
July 2022
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natali3221
1) cos11α-cos13α=2sin(11α+13α)\2·sin(13-11α)\2=2sin12α·sinα
2) sin52+sin8=2sin(52+8)\2·cos(52-8)\2=2sin30·cos22=2·1\2·cos22=cos22
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Answers & Comments
2) sin52+sin8=2sin(52+8)\2·cos(52-8)\2=2sin30·cos22=2·1\2·cos22=cos22