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"2.) If \\( \\angle A = 30 ^ { \\circ } , \\) show that \\( \\frac { 2 \\tan A } { 1 - \\tan ^ { 2 } A } = \\sqrt { 3 } \\)\n3. Find the slant height of a cone, if its total surface area is 7128 sq. cm\nand radius of base is 28\\( \\mathrm { cm } . \\left( \\pi = \\frac { 22 } { 7 } \\right) \\)"

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