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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
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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