Question: En posant u = x, que devient x cosec (a 4 ) dac ? O u' cosec (us ) du 07 / u3 cosec (u2)

En posant u = x, que devient x cosec (a 4 ) dac ? O u' cosec (us ) du 07 / u3 cosec (u2) du O us cosec (u2) du O ut cosec (u2) du us cosec (us) du Out cosec (u2) du
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