Indeterminate form trig limits | Calculus (limits)
Many limits involving trig functions have indeterminate form: 0/0, ∞/∞, ∞-∞, or the like. This video gives two important identities, and solves one problem using one of them.
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0:00 Two identities
3:50 Solving sin(9x)/x at 0
7:50 Finding a mistake with a graph