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A questions regarding trigonometric (or inverse) functions. I just can't get it right.

Q1: A picture 2 m high is hung on the wall with its bottom 6 m above the observer's eye level. How far should the viewer stand for the picture to subtend the largest possible vertical angle with the viewer's eye?

Thanks

Also, I would like to know more about (in basic level, I am a first year) the rates of change. I cannot give a specific topic of what I am thinking, but I can give an example:

E1: A light house (P) is located at the middle of a long straight beach with its light-beam rotating at 3 rpm. And 2000 m directly below the location of P, a ship (S) travels towards the P at 20 km/s. How fast is the light moving at point S at this moment?

(Please don't try to do this, as I made this thing up).

If you know the topic, please reply and just leave the topic name (and by any chance you know a great site explaining it, then please tell me the site as well!!)

Thanks :)

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# Inverse Trigonometric Functions / Rates of change with 2 points of references

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