If 2seca - (1 + sina)/cosa = x, then the value of x is
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(2/cosa -(1+sina))cosa =x
seca(2-1-sina) =x
seca(1-sina)=x
x= cosa(1-sina)
seca(2-1-sina) =x
seca(1-sina)=x
x= cosa(1-sina)
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