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Grade: 10 

                        
If Sin alpha × sin bita - cos alpha × cos bita = 1 show that tan alpha+tan bita =0
3 years ago

Answers : (1)

Shailendra Kumar Sharma
188 Points 
							Sin alpha × sin bita - cos alpha × cos bita = 1=> - Cos( alpha+beta) =1=> Cos( alpha+ beta) =-1So Sin( alpha+ beta) =0And tan(( alpha+ beta) =0USE FORMULA for tan(a+b)This tanalpha + tanBETA =0
3 years ago
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