The most important limit in Calculus // Geometric Proof & Applications
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Definition of the Derivative | Part I
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Proofs: Lim sinx/x =1 and lim [cosx -1] /x =0 as x goes to zero from geometry
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All the TRIG you need for calculus actually explained
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The Limit (do not use L'Hospital rule)
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Sandwich (Sıkıştırma) Teoremi ve sinx/x İspatı
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Proof: lim (sin x)/x | Limits | Differential Calculus | Khan Academy
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Derivative of sin x and cos x
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