In `[-pi, pi]`, solution of inequality………. `cos 2x+5cos x +3 ge 0` isA. `[-pi, pi]`B. `[(-5pi)/(6), (pi)/(6)]`C. `[0, pi]`D. `[(-2pi)/(3), (2pi)/(3)]`

In `[-pi, pi]`, solution of inequality………. `cos 2x+5cos x +3 ge

1.	In `[-pi, pi]`, solution of inequality………. `cos 2x+5cos x +3 ge 0` isA. `[-pi, pi]`B. `[(-5pi)/(6), (pi)/(6)]`C. `[0, pi]`D. `[(-2pi)/(3), (2pi)/(3)]`
Answer» Correct Answer - D In `[-pi, pi]`, solution …………. `cos 2x +5 cos x + 3ge 0 2cos^(2)x +5cos x + 2ge 0` `(cos x +2)(2cos x +1)ge 0 implies 2cos x + 1 ge 0` `(cos x + 2 ge 0)` `cos x ge - (1)/(2) implies x epsilon [- (2pi)/(3), (2pi)/(3)]`

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In `[-pi, pi]`, solution of inequality………. `cos 2x+5cos x +3 ge 0` isA. `[-pi, pi]`B. `[(-5pi)/(6), (pi)/(6)]`C. `[0, pi]`D. `[(-2pi)/(3), (2pi)/(3)]`

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