Sin(A + B) = sinAcosB + cosAsinB
cos(A + B) = cosAcosB - sinAsinB
If sinA = β
and sinB =...
Mathematics, 29.05.2020 09:58 kleathers97
Sin(A + B) = sinAcosB + cosAsinB
cos(A + B) = cosAcosB - sinAsinB
If sinA = β
and sinB = 5/13 where both angles A & B are in quadrant II. Find sin(A + B).
sinA = β
& cosA = -β
and sinB = 5/13 & cosB = -12/13
sin(A + B) = (β
)(-12/13) + (-β
)(5/13) = (-36/65) + (-20/65) = -56/65
USING THIS INFORMATION FIND cos(A+B)
Answers: 1
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