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If 5 cos 2 theta + 2 cos ^(2) ""(theta)...

If ` 5 cos 2 theta + 2 cos ^(2) ""(theta)/(2) + 1 = 0 , - pi lt theta lt pi` then number of solutions are

A

3

B

4

C

5

D

6

Text Solution

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The correct Answer is:
B
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AAKASH SERIES-TRIGNOMETRIC EQUATIONS-PRACTICE SHEET (EXERCISE -I LEVEL -I STRAIGHT OBJECTIVE TYPE QUESTIONS)
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  15. If 5 cos 2 theta + 2 cos ^(2) ""(theta)/(2) + 1 = 0 , - pi lt theta l...

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