1(viii)
(1 + sin A)(1 - sin A) is equal to :
- (a)cosec2 A
- (b)sin2 A
- (c)sec2 A
- (d)cos2 A
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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.
(1 + sin A)(1 - sin A) is equal to :
ICSE Class 10 Mathematics PYQ · 2023 Paper · Section A