Choose the correct options for the following questions.
$\cos^{-1}\frac{12}{13}$=
Difficulty: Easy
A:
$\tan^{-1}\frac{3}{5}$
B:
$\cot^{-1}\frac{13}{12}$
C:
$\sec^{-1}\frac{13}{12}$
D:
$\sin^{-1}\frac{5}{13}$
$\cos^{-1}(\cos x)$=
Difficulty: Easy
A:
x
B:
cos x
C:
x=1/x
D:
$\cos^{-2}x$
$\cos^{-1}(-x)$=
Difficulty: Easy
A:
-x
B:
1/x
C:
$\tan^{-1}x$
D:
$\pi-\cos^{-1}x$
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