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Tamiku [17]
3 years ago
12

Lim -> 0 sin(2x) /(x*cos(x) ) help

Mathematics
1 answer:
Ilya [14]3 years ago
4 0
Sin (2x) can be written like:sin (2x) = 2sin(x)cos(x)
substituting this expresion in the original one:sin(2x) /(x*cos(x) =2sin(x)cos(x)/x*cos(x)=2sinx/x
taking limits, and noticing that lim as x->0 of sinx/x=1:lim 2sinx/x=2*1=2x->0
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