Yesterday we learn in class Double Angel Trigonometric.
Sin(2Ө)=Sin(Ө+Ө)
=SinӨCosӨ + CosӨSinӨ
=2sinӨCosӨ
Cos(2Ө)=Cos(Ө+Ө)
=CosӨSinӨ - CosӨSinӨ
=Cos²Ө - Sin²Ө
Tan(2Ө)=Tan(Ө+Ө)
=TanӨ + TanӨ
1 - TanӨTanӨ
=2 TanӨ
1 - TanӨ
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