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cos2A+1/1-cos2A=cot square Asir get the answer please help me

cos2A+1/1-cos2A=cot square Asir get the answer please help me

Question Image
Grade:10

1 Answers

Arun
25763 Points
3 years ago
Use cos 2A = 2 cos²A -1
& Cos 2A = 1 - 2sin²A
Now
(2 cos²A - 1 +1)/(1-1 + 2 sin²A)
= 2 cos²A/ 2 sin²A
= Cot²A
Hence proved.
 
Regards
Arun (askIITians forum expert)

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