How can tangent approach negative infinity at +Pi/2 (for example) and how can it approach positive infinity at negative pi/2? I understand why it's negative infinity at negative pi/2 ( sinx=-1, cosx=0,
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SOLVED:Use the power series for tan ^-1 x to prove the following expression for πas the sum of an infinite series: π=2 √(3) ∑n=0^∞ ((-1)^n)/((2 n+1) 3^n)
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![L'HOPITAL'S RULE | What's the limit of [(π/2-x)-tan(x)] as x goes to π/2? | Calculus - YouTube](https://i.ytimg.com/vi/4ycqPHXNHyM/maxresdefault.jpg "L'HOPITAL'S RULE | What's the limit of [(π/2-x)-tan(x)] as x goes to π/2? | Calculus - YouTube")
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