If SinA=3/5,find Sin3A
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Sina =3/5
Cosa =4/5
Sin3A=3SinA-4Sin³A
=3*3/5-4*27/125
=9/5-108/125
=225-108/125
=117/125
HOPE HELPED!
Cosa =4/5
Sin3A=3SinA-4Sin³A
=3*3/5-4*27/125
=9/5-108/125
=225-108/125
=117/125
HOPE HELPED!
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