(sin A-1) (sin A+1) =?
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Answer:
-cos²A
Step-by-step explanation:
(sin A-1) (sin A+1)
= sin²A-1²
= sin²A-1
= -cos²A
using formula sin²A+cos²A = 1
=> 1-sin²A = cos²A
=> sin²A-1 = -cos²A
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