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Verified answer
(cos x)²-3 cos x-4=0 misal cos x=aa²-3a-4=0
(a-4)(a+1)=0
a=4 atau a=-1
Karena nilai maksimal cos =1, maka a=4 tidak diterima
a=-1
cos x=-1
x=180°
HP:{180°}
jika ini membantumu,tolong jadikan jawaban terbaik y