Q.
If cot2Acot2B=3, then the value of (2 - cos 2A) (2 - cos 2B) is ___________.
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answer is 3.
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Detailed Solution
(2−cos2A)(2−cos2B) =1+2sin2A1+2sin2B =1+2sin2A+sin2B+4sin2Asin2B …….. (1)Now, cot2A cot2B=3⇒ cos2Acos2B=3sin2Asin2B⇒ 1−sin2A1−sin2B=3sin2Asin2B⇒ sin2A+sin2B+2sin2Asin2B=1From (1), we get(2−cos2A)(2−cos2B)=1+2=3
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