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Grade: 12
        
Cos-1(12/13)+2cos-1(√64/√65)+cos-1(√49/√50)=cos-1(1/√2)
3 months ago

Answers : (1)

Vikas TU
9468 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 
 
 
3 months ago
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