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Yakvenalex [24]
3 years ago
15

Cos(sin15/17-(sin-5/13)

History
1 answer:
valina [46]3 years ago
8 0
If sin
=5/13

then the ratio of opposite side/hypotenuse
=5/13
By Pythagorean Theorem
If opposite side =5units and
hypotenuse =13 units

(for any units)
then adjacent side=12 units
and
cos=adjacent side over
hypotenuse =12/13

However, we need to note that if the angle is in Quadrant II then the
adjacent side
will actually be a negative value
so
cos= 12/13 for an angle in Q1
or
cos= -12/13 for an angle in Q2
(angle can’t be in Q3 or Q4, since sin > 0)
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