Prove that cos 5100 cos 3300 + sin 3900 cos 1200 = -1
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Step-by-step explanation:
From our calculator
We know cos5100=0
Cos3900=0
Sin3900=-1
Cos1200=0
Soit will be
Cos5100cos3300=0
Sin3900cos1200=-1
0+-1=-1
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