101. Trigonometric limit: x per secant per cosecant

▼ IMPORTANT ▼ Worked example of trigonometric limit in which we have x per sec times csc, using trigonometric identities to reduce to sines and cosines and use notable limit, step by step.
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** BIBLIOGRAPHY **
Calculus of a variable, James Stewart
Calculus, M. Spivak
5000 mathematical analysis problems, B. Demidovich
Calculus, Granville
Simplified Mathematics, by Conamat
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