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Nika00666
@Nika00666
November 2021
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напишите в виде произведения:Cos11pi/12+cos3pi/4
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Lesben
Cos a + cos b = 2.cos (a+b)/2 .cos (a-b)/2
cos 11pí/12+cos 3pí/4= 2. cos (11pí/12+3pí/4)/2).cos (11pí/12-3pí/4)/2=
=2.cos( 2pí/3).cos (pí/12)
2 votes
Thanks 2
Nika00666
спасибо
Nika00666
сможешь еще кое что решить пожалуйста
Nika00666
представьте в виде произведения sinx-cosy
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Answers & Comments
cos 11pí/12+cos 3pí/4= 2. cos (11pí/12+3pí/4)/2).cos (11pí/12-3pí/4)/2=
=2.cos( 2pí/3).cos (pí/12)