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```
Cos-1(12/13)+2cos-1(√64/√65)+cos-1(√49/√50)=cos-1(1/√2)

```
one year ago

Vikas TU
13784 Points
```							Dear stuedent Cos-1(12/13) = tan-1 (5/12)cos-1(√64/√65) = tan-1 (1/8) cos-1(√49/√50) = tan-1 (1/7)Now use tan-1 (a) + tan-1(b) formula and find a tan-1(c) Now again find tan-1(c) + tan-1(d) and equate LHS = RHS Hope this helps Good luck
```
one year ago
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• Test paper with Video Solution
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• Previous Year Exam Questions