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(x*tanx)/2sin^2x
turunkan.
limit x menuju 0
(tanx + x.sec^2x)/(2sin(2x))
turunkan lagi
limit x menuju 0
(sec^2x + sec^2x + x.2*sec^2x.tanx)/4cos(2x)
= (1 + 1)/(4.1)
= 2/4
= 1/2
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atau bisa langsung, khusus buat sin dan tan.
limit x mendekati 0
x.tanx/2.sin^2x
= 1.1/(2.1^2)
= 1/2