Without using a calculator, find the exact value of
sec
−
1
(
−
2
3
3
)
\displaystyle {{\sec}^{{-{{1}}}}{\left(-\frac{{{2}\sqrt{{{3}}}}}{{3}}\right)}}
sec
−
1
(
−
3
2
3
)
. Give your angle in
radians
(use
pi
for
π
\displaystyle \pi
π
).
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\displaystyle
Enter your answer as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)
Enter DNE for Does Not Exist, oo for Infinity