tan (In y) = x ⇒In y = tan-1x ⇒y = etan-1x
y1=etan-1x1+x2⇒y2=1(1+x2)2etan-1x + etan-1 (-2x)(1+x2)2
at x = 0, y2(0) =11×e0+e0×01=1
অতএব, y2(0) = 1
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