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Sagot :
Answer:
step by step below
Step-by-step explanation:
(cscA+1).(1-sinA)=cosA.cotA
(1/sinA +1).(1-sinA) = 1/sinA*(1 - sinA) + 1*(1-sinA)
= 1/sinA - 1 + 1 - sinA
= 1/sinA - sinA
= (1 - sin²A) / sinA
=cos²A / sinA
= cosA*cosA / sinA
=cosA*cotA
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