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wingsoflirry
@wingsoflirry
June 2021
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Cosinus tangente sinus 3ème
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Xiout
(cos a+sin a)²=
(cos a)²+2(cos a)(sin a)+(sin a)²
or (cos a)²+(sin a)² = 1
on a donc 1+ 2(cos a)(sin a)
(cos a-sin a)²=
(cos a)²-2(cos a)(sin a)+(sin a)²
or (cos a)²+(sin a)² = 1
on a donc 1- 2(cos a)(sin a)
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wingsoflirry
merci!
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Lista de comentários
(cos a)²+2(cos a)(sin a)+(sin a)²
or (cos a)²+(sin a)² = 1
on a donc 1+ 2(cos a)(sin a)
(cos a-sin a)²=
(cos a)²-2(cos a)(sin a)+(sin a)²
or (cos a)²+(sin a)² = 1
on a donc 1- 2(cos a)(sin a)