Question

sin²A /1-cos A

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Answer 1

Answer:

cos 2a =$cos^{2} A/1-cos a$

Step-by-step explanation:

Answer 2

Answer:

$\frac{{ \sin }^{2} a}{1 - cosa} = \frac{1 - {cos}^{2}a }{1 - cosa} = \frac{(1 - cosa)(1 + cosa)}{1 - cosa} = 1 + cosa$

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