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bellalala
@bellalala
July 2022
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Помогите доказать равенство, пожалуйста!
sin160 - sin 100 = - cos50
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lizaveta234
Verified answer
Sin160 - sin 100 = - cos50
2 *sin(160-100)/2 *cos (160+100)/2= - cos 50
2 *sin30*cos130= - cos50
2*1/2* cos(180-130)= - cos50
- cos50= - cos 50
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Answers & Comments
Verified answer
Sin160 - sin 100 = - cos502 *sin(160-100)/2 *cos (160+100)/2= - cos 50
2 *sin30*cos130= - cos50
2*1/2* cos(180-130)= - cos50
- cos50= - cos 50