Mathematics
(1 + sin A)(1 - sin A) is equal to :
cosec2 A
sin2 A
sec2 A
cos2 A
Trigonometric Identities
ICSE 2023
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Answer
Solving,
⇒ (1 + sin A)(1 - sin A)
⇒ 1 - sin A + sin A - sin2 A
⇒ 1 - sin2 A
⇒ cos2 A.
Hence, Option 4 is the correct option.
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