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Bronzor1
@Bronzor1
July 2022
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1) tg(5pi/24)-tg(7pi/24)
2) (sin(7x)-sin(5x))/(sin(7x)+sin(5x))
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Санечка69
Verified answer
1) tg(5
π
/24) - tg(7
π/
24) = (sin(5
π/24 - 7π/24))/(cos(5π/24)cos(7π/24))
2) (sin(7x) - sin(5x))/(sin(7x)+sin(5x)) = 2cos6xsinx/(2sin6xcosx) = ctg6xtgx
2 votes
Thanks 1
Bronzor1
В первом примере в конце не sin(7π/24) а cos
Санечка69
а самому (самой) было никак?
Bronzor1
мог и сам,но что-то мешало в любом случае спасибо.
Санечка69
молодец, что нашел ошибку - я вообще этими формулами не пользовалась практически никогда
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Answers & Comments
Verified answer
1) tg(5π/24) - tg(7π/24) = (sin(5π/24 - 7π/24))/(cos(5π/24)cos(7π/24))2) (sin(7x) - sin(5x))/(sin(7x)+sin(5x)) = 2cos6xsinx/(2sin6xcosx) = ctg6xtgx