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cos(360-a) = cos a
tan(270+a) = - cot a
cot(180-a) = - cot a
jadi cos a - cos a / -cot a - cot a = 0
sebenarnya yg dibwh tdk usah diubah lagi tetap seperti soal soalya yg diatas sdh 0 pasti hasilnya 0 tp ngak apa2 kalo mau lbh lengkap lagi ditulis aja semua