Find tan2A when cosA = -3/5 and π/2<A<π.

Find tan2A when cosA = -3/5 and π/2<A<π.

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kosine=-(3/5)=-0.6

yuze invers kosine tu get ang...+126.86989764787603 deg

2* angel=l253.7397952957521 deg

tan=3.4285714294761535
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