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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
Let alpha = x....and beta = y...Now given that...cosx + cosy =0 and sinx +siny =0So....cosx=-cosy and sinx=-siny...Now.. -cos(x+y)= -[cosx.cosy - sinx.siny] Now...on solving you will getcos*2x - sin*2x= cos2x OrCos*2y -sin*2y = cos2y......
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