A plane flying with a constant speed of 300

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A plane flying with a constant speed of 300 km/h passes over a ground radar station at an altitude of 1 km and climbs at an angle of 30 degrees. At what rate is the distance from the plane to the radar station increasing a minute later?
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These chap 3 related rates problems are super helpful.

angieg
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thank you for the video, I'm just curious, why couldn't we straight away implicitly differentiate the equation C^2=A^2+B^2-2ABcosC, given that when I do that, I get a different answer.

DovranBabayev-gn