The limit of sin(x)/x as x goes to 0,
Proof of the derivative of sin(x),    • Derivative of sin(x) and cos(x), PROOF  

No, we cannot use Taylor series for sin(x) since we need derivative as well.    • Power series of sin(x) and cos(x) at 0  

The limit as x goes to 0 of sin(x)/x ,
Geometric proof of sin(x)/x goes to 1 as x goes to 0,
don't use l'hospital's rule,
avoid circular reasoning,
Squeeze theorem example,



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