1
JEE Main 2020 (Online) 9th January Morning Slot
+4
-1
The value of
$${\cos ^3}\left( {{\pi \over 8}} \right)$$$${\cos}\left( {{3\pi \over 8}} \right)$$+$${\sin ^3}\left( {{\pi \over 8}} \right)$$$${\sin}\left( {{3\pi \over 8}} \right)$$
is :
A
$${1 \over {\sqrt 2 }}$$
B
$${1 \over 2}$$
C
$${1 \over 4}$$
D
$${1 \over 2{\sqrt 2 }}$$
2
JEE Main 2019 (Online) 12th April Morning Slot
+4
-1
The equation y = sinx sin (x + 2) – sin2 (x + 1) represents a straight line lying in :
A
B
C
D
3
JEE Main 2019 (Online) 9th April Evening Slot
+4
-1
The value of sin 10º sin30º sin50º sin70º is :-
A
$${1 \over {36}}$$
B
$${1 \over {16}}$$
C
$${1 \over {32}}$$
D
$${1 \over {18}}$$
4
JEE Main 2019 (Online) 9th April Morning Slot
+4
-1
The value of cos210° – cos10°cos50° + cos250° is
A
$${3 \over 2} + \cos {20^o}$$
B
$${3 \over 4}$$
C
$${3 \over 2}(1 + \cos {20^o})$$
D
$${3 \over 2}$$
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