› trigonometry in a
triangle
that has one
angle
of 90°, the
ratio
(=
relationship
) of the
length
of the
side
opposite
an
angle
less than 90°
divided
by the
length
of the
hypotenuse
(= the
side
opposite
the 90°
angle
)

(Definition of sine noun from the Cambridge Academic Content Dictionary
© Cambridge University Press)

Focus on the pronunciation of sine
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