(1-cosA)(1+cosA) = sin²A
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Step-by-step explanation:
(1-cosA) (1+cosA)=
(1-cos²A) =sin²A
Answered by
0
Answer:
Step-by-step explanation:
RHS = sin2A
=1 - cos2A
=(1+cosA)(1-cosA)
=LHS
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