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కింది వాటిని రుజువు చేయండి. cos {2[(Tan^...

కింది వాటిని రుజువు చేయండి. `cos {2[(Tan^-1) 1/4 + (Tan^-1) 2/9]}=3/5`

Text Solution

Verified by Experts

The correct Answer is:
`(3)/(5)`
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