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If sinx+cos e cx+tany+coty=4 where x a ...

If `sinx+cos e cx+tany+coty=4` where `x a n d y in [0,pi/2],t h e ntan(y/2)` is a root of the equation (a)`alpha^2+2alpha+1=0` (b) 2`alpha^2-2alpha-1=0` (c)`2alpha^2-2alpha-1=0` (d) `alpha^2-alpha-1=0`

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