This chapter is currently out of syllabus
1
JEE Main 2018 (Offline)
+4
-1
Out of Syllabus
If sum of all the solutions of the equation

$$8\cos x.\left( {\cos \left( {{\pi \over 6} + x} \right).\cos \left( {{\pi \over 6} - x} \right) - {1 \over 2}} \right) = 1$$

in [0, $$\pi$$] is k$$\pi$$, then k is equal to
A
$${{20} \over 9}$$
B
$${2 \over 3}$$
C
$${{13} \over 9}$$
D
$${{8} \over 9}$$
2
JEE Main 2018 (Online) 15th April Evening Slot
+4
-1
Out of Syllabus
The number of solutions of sin3x = cos 2x, in the interval $$\left( {{\pi \over 2},\pi } \right)$$ is :
A
1
B
2
C
3
D
4
3
JEE Main 2016 (Online) 9th April Morning Slot
+4
-1
Out of Syllabus
The number of x $$\in$$ [0,   2$$\pi$$ ] for which

$$\left| {\sqrt {2{{\sin }^4}x + 18{{\cos }^2}x} - \sqrt {2{{\cos }^4}x + 18{{\sin }^2}x} } \right| = 1$$ is :
A
2
B
4
C
6
D
8
4
JEE Main 2016 (Offline)
+4
-1
Out of Syllabus
If $$0 \le x < 2\pi$$, then the number of real values of $$x$$, which satisfy the equation $$\,\cos x + \cos 2x + \cos 3x + \cos 4x = 0$$ is:
A
7
B
9
C
3
D
5
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