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cos^2(x)/sin^2(x)=1
cot^2x=+-1
tan^2x=+-1
tanx=1
tanx= -1
karena pangkat 2 hasilnya bisa negatif dan positif
tanx=1
x=45+k.180
tanx= -1
x=135+k.180
k --> (1,2,3,...)
1) x=45
2) x=135
3) x=225
4) x=315