Calculus

Find the limit

lim tan^2(7x)/9x
x-> 0

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  1. recall that tanx/x = sinx/x = 1
    as x -> 0

    so, this limit is

    7/9 * tan(7x)/(7x) * tan(7x)
    -> 7/9 * 1 * 0 = 0

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