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Cos alpha plus cos Nita is equal to zero is equal to sin alpha plus sin Nita then minus cos (alpha plus bita

Cos alpha plus cos Nita is equal to zero is equal to sin alpha plus sin Nita then minus cos (alpha plus bita
 
 
 

Grade:8

1 Answers

Pradeep Tangirala
73 Points
3 years ago
Let alpha = x....and beta = y...
Now given that...cosx + cosy =0 and sinx +siny =0
So....cosx=-cosy and sinx=-siny...
Now..  -cos(x+y)= -[cosx.cosy - sinx.siny]
             Now...on solving you will get
cos*2x - sin*2x= cos2x 
             Or
Cos*2y -sin*2y = cos2y...... 

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