1

IIT-JEE 2001 Screening

MCQ (Single Correct Answer)
If $${\sin ^{ - 1}}\left( {x - {{{x^2}} \over 2} + {{{x^3}} \over 4} - ....} \right)$$ $$$ + {\cos ^{ - 1}}\left( {{x^2} - {{{x^4}} \over 2} + {{{x^6}} \over 4} - ....} \right) = {\pi \over 2}$$$
for $$0 < \left| x \right| < \sqrt 2 ,$$ then $$x$$ equals
A
$$1/2$$
B
$$1$$
C
$$-1/2$$
D
$$-1$$
2

IIT-JEE 1999

MCQ (Single Correct Answer)
The number of real solutions of
$${\tan ^{ - 1}}\,\,\sqrt {x\left( {x + 1} \right)} + {\sin ^{ - 1}}\,\,\sqrt {{x^2} + x + 1} = \pi /2$$ is
A
zero
B
one
C
two
D
infinite
3

IIT-JEE 1994

MCQ (Single Correct Answer)
If we consider only the principle values of the inverse trigonometric functions then the value of
$$\tan \left( {{{\cos }^{ - 1}}{1 \over {5\sqrt 2 }} - {{\sin }^{ - 1}}{4 \over {\sqrt {17} }}} \right)$$ is
A
$${{\sqrt {29} } \over 3}$$
B
$${{29} \over 3}$$
C
$${{\sqrt 3 } \over {29}}$$
D
$${3 \over {29}}$$
4

IIT-JEE 1986

MCQ (Single Correct Answer)
The principal value of $${\sin ^{ - 1}}\left( {\sin {{2\pi } \over 3}} \right)$$ is
A
$${ - {{2\pi } \over 3}}$$
B
$${{{2\pi } \over 3}}$$
C
$${{{4\pi } \over 3}}$$
D
none

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