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If `secalpha+tanalpha=m, " then " sec^(4)alpha-tan^(4)alpha-2sec alpha tan alpha` is ___________.

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If `secalpha+tanalpha=m, " then " sec^(4)alpha-tan^(4)alpha-2sec alpha tan alpha` is ___________.
A. `m^(2)`
B. `-m^(2)`
C. `(1)/(m^(2))`
D. `(-1)/(m^(2))`
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Correct Answer - C
Simplify the given expression and find `secalpha-tanalpha`.
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