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यदि 0 le xle2pi है तो x के उन वास्तविक ...

यदि `0 le xle2pi` है तो x के उन वास्तविक मानो की संख्या जो समीकरण `cosx+cos2x+cos3x+cos4x=0` को संतुष्ट करते है, है
(i) 9 (ii) 3 (iii) 5 (iv) 7

A

9

B

3

C

5

D

7

लिखित उत्तर

Verified by Experts

The correct Answer is:
4
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