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If f (x) = (- K2 + 3K + 4) x + 2 is an increasing function, then the range of K is
Because it's an increasing function, then
-k2+3k+4>0
k2-3k-4
Take the origin as the pole, take the positive half axis of X axis as the polar axis, and rewrite the circle with the center of circle (0, - 2) and radius 1 into the polar coordinate equation?
Please note: it's a polar equation, not a parametric equation!
If the rectangular coordinate equation (x + 2) & sup2; + Y & sup2; = 1 is changed to polar coordinate equation x = RCOs θ y = rsin θ, then (RCOs θ + 2) & sup2; + R & sup2; sin & sup2; θ = 1, R & sup2; + 2rcos θ + 3 = 0
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