Which functions are strictly convex on their whole domain?
1. f(x)=20x+3f(x) = 20x+3f(x)=20x+3
2. f(x)=12exf(x) = \frac{1}{2}e^xf(x)=21ex
3. f(x)=tanx+1f(x) = \tan{x}+1f(x)=tanx+1
4. f(x)=−0.01xf(x) = -\sqrt{0.01x}f(x)=−0.01x
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