tyneshiajones124
10.05.2021 •
Mathematics
HELP
I usually wouldn’t come on here and ask hella but I need to get this done
Solved
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Ответ:
sec t = 1/cos t so
= cos t( 1/cos t - cos t)
= cos t / cos t - cos²t (distribute)
= 1 - cos²t
since sin²t + cos²t = 1, we have sin²t = 1 - cos²t
so
= sin² t
=right-hand side