1
JEE Main 2017 (Offline)
+4
-1
If $$5\left( {{{\tan }^2}x - {{\cos }^2}x} \right) = 2\cos 2x + 9$$,

then the value of $$\cos 4x$$ is :
A
$${1 \over 3}$$
B
$${2 \over 9}$$
C
$$- {7 \over 9}$$
D
$$- {3 \over 5}$$
2
JEE Main 2016 (Online) 9th April Morning Slot
+4
-1
If  m and M are the minimum and the maximum values of

4 + $${1 \over 2}$$ sin2 2x $$-$$ 2cos4 x, x $$\in$$ R, then M $$-$$ m is equal to :
A
$${{15} \over 4}$$
B
$${{9} \over 4}$$
C
$${{7} \over 4}$$
D
$${{1} \over 4}$$
3
JEE Main 2014 (Offline)
+4
-1
Let $$f_k\left( x \right) = {1 \over k}\left( {{{\sin }^k}x + {{\cos }^k}x} \right)$$ where $$x \in R$$ and $$k \ge \,1.$$
Then $${f_4}\left( x \right) - {f_6}\left( x \right)\,\,$$ equals :
A
$${1 \over 4}$$
B
$${1 \over 12}$$
C
$${1 \over 6}$$
D
$${1 \over 3}$$
4
JEE Main 2013 (Offline)
+4
-1
The expression $${{\tan {\rm A}} \over {1 - \cot {\rm A}}} + {{\cot {\rm A}} \over {1 - \tan {\rm A}}}$$ can be written as:
A
$$\sin {\rm A}\,\cos {\rm A} + 1$$
B
$$\,\sec {\rm A}\,\cos ec{\rm A} + 1$$
C
$$\tan {\rm A} + \cot {\rm A}$$
D
$$\sec {\rm A} + \cos ec{\rm A}$$
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