The rationalising factor of ${a^{1/3}} + {a^{ - 1/3}}$ is
The rationalising factor of ${a^{1/3}} + {a^{ - 1/3}}$ is
- A
${a^{1/3}} - {a^{ - 1/3}}$
- B
${a^{2/3}} + {a^{ - 2/3}}$
- C
${a^{2/3}} - {a^{ - 2/3}}$
- D
${a^{2/3}} + {a^{ - 2/3}} - 1$
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${{{{[4 + \sqrt {(15)} ]}^{3/2}} + {{[4 - \sqrt {(15)} ]}^{3/2}}} \over {{{[6 + \sqrt {(35)} ]}^{3/2}} - {{[6 - \sqrt {(35)} ]}^{3/2}}}} = $
${{{{[4 + \sqrt {(15)} ]}^{3/2}} + {{[4 - \sqrt {(15)} ]}^{3/2}}} \over {{{[6 + \sqrt {(35)} ]}^{3/2}} - {{[6 - \sqrt {(35)} ]}^{3/2}}}} = $
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