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Question Number 207287 by rodrigue last updated on 10/May/24

Commented by rodrigue last updated on 10/May/24

$$needhelphere$$

Commented by mr W last updated on 11/May/24

$$obvioussolution:$$$$\cos x=0\Rightarrow x=2k\pi \pm \frac{\pi }{2}$$$$otherexactsolutionsarenotpossible!$$

Commented by rodrigue last updated on 11/May/24

yeah that what i was thinking of. thanks

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