Let T=  tanx-sinx + T T2-T+sinx-tanx=0 T=[1+- 1+4tanx-4sinx]/2 Let V= x 3+V V2-V-x3=0 V= 1+- 1+4x 3/2 lim -1 + T/-1+V x-0 lim [-1 + 1+4tanx-4sinx]/[-1+ 1+4x 3] x-0 differentiate lim [(sec 2x-cosx) 1+4x 3 ]/12x 2root(1+4tanx-4sinx) x-0 again differentiate and solve i think the answer is 1/8
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