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*** Sin 115 = Sin (90 + 25)
= Sin90Cos25 +Cos90Sin25
= Cos 25
= n
*** Cos 155 = Cos(180 - 25)
= Cos180Cos25 + Sin180Sin25
= (-1).Cos25 - 0.(Sin25)
= - Cos 25
= -n
>>>
sin115° - cos 155°/sin115° × cos 155°
n - (-n) / n.(-n)
n + n / -n²
2n/-n²
-2n/n²
-2/n
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