Derivative of sin(x) and cos(x), PROOF

Geometric proof of sin(x)/x approaches 1 as x approaches 0,    • The Limit (do not use L'Hospital rule)  
Angle sum formula:    • Angle sum identities for sine and cosine  
part1: derivative of sin(x) and cos(x),    • Derivative of sin(x) and cos(x), PROOF  
part2: derivative of tan(x) and cot(x),    • derivatives of tan(x) and cot(x), quo...  
part3: derivative of sec(x) and csc(x),    • derivative of sec(x) and csc(x), quot...  

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