JEE Math Practice Question
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
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