Gujarat BoardEnglish MediumSTD 12 ScienceMathsInverse Trigonometric Functions1 Mark
MCQ
The domain of function $f(x)=\sin ^{-1} x+\cos x$ is-
✓
$[-1,1]$
B
$[-1, \pi+1]$
C
$[-\infty, \infty]$
D
$\phi$
✓
Answer
Correct option: A.
$[-1,1]$
(A) $[-1,1]$ Function $\sin ^{-1} x$ has domain $D _1=[-1,1]$ and function $\cos x$ has domain $D _2= R$ $\therefore$ Domain of $f(x)=\sin ^{-1} x+\cos x$ is $= D _1 \cap D _2=$ $[-1,1] \cap R =[-1,1]$ Hence correct option is (A).
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