tan θ = y/x
sec2θ dθ/dt = 1/x dy/dt - y/x2 dx/dt
let θ(in radians) be an acute angle in a right triangle, and let x and y, respectively, be the lenghts of the sides adjacent and opposite θ. suppose also that both x and y vary with time
how are dθ/dt, dx/dt, and dy/dt related?
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