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Verified answer
Jawabsin A = 3/5
cos A = √(1 - sin² A)
cos A = √(1- (3/5)²) = √(1 - 9/25) = √(16/25)
cos A = +- 4/5
karena A di kuadran II , maka nilai cos A negatif
cos A = - 4/5
sin 2 A = 2 sin A cos A
= 2 (3/5)(-4/5)
= - 24/25
maka Cos A=4/5
sin 2A=sin(A+A)
=sina.cosa+cosa.sina
=2 cosa.sina
=2.4/5.3/5
=24/25