Originally Posted by

**spoc21** Hi,

I'm having trouble with the following two questions which are applications of trig derivatives:

1) A rocket is moving into the air with a height function given by $\displaystyle h(t) = 200t^2$. A camera located 150 m away from the launch site is filming the launch. How fast must the angle of the camera be changing with respect to the horizontal 4 seconds after lift off?

2) The base of an isosceles triangle is 20 cm and the altitude is increasing at the rate of 1 cm/min. At what rate is the base angle increasing when the area is $\displaystyle 100 cm^2?$