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x^2 sin(1/x) tan(1/x)
karena bentuknya tak hingga kali 0, ubah bentuk persamaan.
= limit x menuju tak hingga
(sin(1/x) tan(1/x) ) / (1/x^2)
turunkan
= limit x menuju tak hingga
((sin(1/x) - (tan(1/x)sec(1/x))/x^2) / (-2/x^3)
= limit x menuju tak hingga
((-sin(1/x) - (tan(1/x)sec(1/x))) / (-2/x)
= limit x menuju tak hingga
((cos(1/x) + sec^3(1/x) +tan^2(1/x)sec(1/x))/x^2) / (2/x^2)
= limit x menuju tak hingga
(cos(1/x) + sec^3(1/x) +tan^2(1/x)sec(1/x))/2
= (cos0 + sec^3(0) + tan^2(0)sec(0))/2
= (1 + 1 + 0)/2
= 2/2
= 1