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1
JEE Main 2021 (Online) 25th July Morning Shift
MCQ (Single Correct Answer)  +4  -1
The sum of all values of x in [0, 2$$\pi$$], for which sin x + sin 2x + sin 3x + sin 4x = 0, is equal to :
A
8$$\pi$$
B
11$$\pi$$
C
12$$\pi$$
D
9$$\pi$$
2
JEE Main 2021 (Online) 18th March Evening Shift
MCQ (Single Correct Answer)  +4  -1
If 15sin4$$\alpha$$ + 10cos4$$\alpha$$ = 6, for some $$\alpha$$$$\in$$R, then the value of

27sec6$$\alpha$$ + 8cosec6$$\alpha$$ is equal to :
A
500
B
400
C
250
D
350
3
JEE Main 2021 (Online) 17th March Evening Shift
MCQ (Single Correct Answer)  +4  -1
The number of solutions of the equation x + 2tanx = $${\pi \over 2}$$ in the interval [0, 2$$\pi$$] is :
A
4
B
3
C
2
D
5
4
JEE Main 2021 (Online) 16th March Morning Shift
MCQ (Single Correct Answer)  +4  -1
The number of roots of the equation, (81)sin2x + (81)cos2x = 30 in the interval [ 0, $$\pi$$ ] is equal to :
A
2
B
3
C
4
D
8
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