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Sagot :
Answer:
step below
Step-by-step explanation:
√(1-cos A) / (1+cos A) = √(1-cos A)*(1-cos A) / (1+cos A)*)1-c0s A)
==> √(1-cos A)² / (1-cos² A)
==> √(1-cos A)² / sin² A
==> (1-cos A) / sin A
==> 1/sin A - cos A/sin A
==> cosec A - cot A
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